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Jaw lock and jaw clamp: first aid and exercises

Your mouth won't open, or won't close after a yawn? Jaw clamp and jaw lock are two different things with different first aid. Here's how to tell them apart, what you can do right away and how to eat.

Frau mit Kieferklemme hält sich beim Frühstück den Kiefer und versucht, einen Löffel Haferbrei zu essen
Jaw clamp: when your mouth only opens a crack, what you eat over the next few days helps decide how quickly you're back on your feet.

The key points in 30 seconds

Normal mouth opening
47mm

This is how wide the mouth opens on average in healthy adults, measured between the cutting edges of the teeth; 98% fall between 34 and 60 millimetres. At 35 millimetres or less, doctors speak of a jaw clamp.

Does the jaw lock happen again?
20%

In about one in five people whose jaw joint has been dislocated once, it happens again, according to the oral surgeons' guideline. So after it's been put back: don't open wide for several weeks, and put your fist under your chin when you yawn.

After wisdom tooth surgery
12mm

That's how much less your mouth opens on the first day after the operation compared with before, according to a Graz study of 100 procedures; by day 7, about half of that is back.

What counts when you eat
Soft & small

Anything that stays on the spoon and slides down without biting: cream soup, skyr, mash with scrambled egg, a drinkable meal. Every portion should contain protein. What fits through the gap is shown in the eating traffic light in chapter 5.

01 Recognise

Lockjaw or locked-open jaw: what's the difference?

In everyday speech both are called “jaw lock”, but medically they are two different things with different first aid. With a jaw clamp (trismus), your mouth won't open, or barely opens, because chewing muscles are cramped, tissue is swollen or the cartilage disc is blocking. With a jaw lock (dislocation), the joint head has jumped in front of the joint bump while yawning or biting, and your mouth won't close. The clamp usually goes away by itself; the lock belongs in a doctor's hands.

At a glance

Jaw clamp or jaw lock?

Two conditions, one jaw joint: how to tell them apart and what to do first.

Jaw clamp (trismus)Jaw lock (dislocation)
What happensMouth won't open, or barelyMouth won't close
Typical triggerDental surgery, injection, infection, tension, stressYawning, laughing, biting into food, vomiting, long dental treatment
How it feelsStiff, tight, often with swelling; opening pulls or hurtsLower jaw sticks out or sits crooked, talking and swallowing are hard, dent in front of the ear
How longDays to about two weeks, depending on the causeUntil someone puts it back in place; after three to four weeks usually only surgery helps
First aidRest, no force, cool after surgery, otherwise warmth, gentle stretchingDon't put it back yourself, keep your mouth still, go to a dental practice or A&E straight away
Where to goDentist or oral surgeon; today if you have a fever and swellingDentist, oral surgeon, ENT or A&E, the same day
EatingSpoonable food, small portions, lukewarm, nothing you have to bite intoSoft and small for weeks after it's put back, don't open your mouth wide

Based on the S3 guideline on jaw joint dislocation (AWMF 007/063), the overview by Prechel and colleagues in Deutsches Ärzteblatt 2018 and the MSD Manual. Jaw clamp means “mouth won't open”, jaw lock means “mouth won't close”.

What is lockjaw: trismus and the 35-millimetre limit

Doctors speak of lockjaw or trismus when the mouth opens 35 millimetres or less; the limit comes from a Dutch study of head and neck patients. On average, a normal opening is 47 millimetres, and 98% of 700 healthy adults measured between 34 and 60. In the Pomerania study, 9% of adults stayed under 40 millimetres, mostly without noticing. For a self-check, the rough test used by British clinics is enough: put three fingers stacked on their edge between your front teeth. If they fit, your opening is normal; if only two or one fit, it's restricted.

Interactive

How wide does your mouth open?

Tap how many fingers fit on their edge between your front teeth, or enter the value you measured.

Tap what fits. The value is the opening between the cutting edges of your upper and lower teeth; finger widths are approximations (one finger is roughly 18, two roughly 30, three roughly 45 millimetres).

Lockjaw symptoms: how to tell

Your mouth doesn't open as far as usual, opening pulls or hurts, and your cheek feels tight or swollen. The accompanying signs give away the cause: after wisdom tooth surgery, lockjaw is part of the normal swelling, a “normal condition that can last a few days”. After an injection in the lower jaw, it starts the next day, without fever, with sore-muscle pain behind the molars. With an infection, fever and growing swelling come on top. With tension or teeth grinding, it's worst in the morning, and your jaw clicks. Lockjaw with no trigger needs to be checked out.

Man checking in the mirror, with three fingers between his teeth, how wide his mouth opens
The finger test: if three fingers fit on their edge between your front teeth, your opening is normal. If only two or one fit, your jaw is stuck.

Dislocated jaw: how to tell

A locked-open jaw happens mid-yawn, mid-laugh, biting into a burger or at the end of a long dental treatment: a jolt, and your mouth stays open. The guideline names a lower jaw that is “fixed in an open position” as the key finding. Your teeth don't meet, your chin sticks out or sits crooked, talking and swallowing are hard, you drool, and you can feel a dent in front of your ear because the joint socket is empty. Waiting doesn't help: the muscles tighten more and more over time. What to do is in chapter 4.

02 Causes

Causes of lockjaw and a stuck-open jaw: why your mouth won't open or close

Lockjaw has four groups of causes. Muscle: clenching and grinding (bruxism), stress, CMD. Treatment: swelling after wisdom tooth surgery or a bruise after the anaesthetic injection. Infection: wisdom tooth, abscess, tonsil abscess. Joint: a cartilage disc that stays stuck at the front. A locked-open jaw almost always has the same trigger: opening too wide when yawning, laughing, biting, vomiting or during a long dental treatment. People with hypermobile joints are more susceptible, and it mostly affects 20- to 40-year-olds.

Lockjaw after wisdom tooth surgery: how long does it last?

Lockjaw after surgery is normal, strongest on days 1 to 3 and mostly gone after about a week. In Graz, 50 patients lost an average of 12 millimetres of mouth opening on the first day; by day 7 they had got almost 6 of it back. In a Turkish study, the opening was 22 millimetres on day 3 and 29 on day 7. The cause is the swelling next to the chewing muscles. If your opening is still just as poor after a week, or gets worse again after day 3, get it checked.

Progress

Mouth opening after wisdom tooth surgery: the typical progress

Distance between the cutting edges in millimetres, combined from three studies with measurements up to day 7; around 40 millimetres counts as normal.

0 mm 13 mm 25 mm 38 mm 50 mm 40 mm Surgery 28 mm Day 1 26 mm Day 3 34 mm Day 7 39 mm Day 14
  1. Surgery: 40 mm Before surgery: normal opening, on average between 34 and 47 millimetres; three fingers fit.
  2. Day 1: 28 mm Low point of the first few days: 12 millimetres less than before in the Graz study. Cool it, eat soft food, don't stretch.
  3. Day 3: 26 mm Swelling is at its worst and opening is often at its smallest (22 millimetres in the Turkish study). From now on, use warmth and gentle opening if the wound is calm.
  4. Day 7: 34 mm About half of the loss is back (29 to 37 millimetres in the studies). Two fingers fit again and eating gets easier.
  5. Day 14: 39 mm Expected value: close to your starting point. If your opening is still just as limited after a week, get it checked.

Typical progress, not a single study: days 1 and 7 after Kirnbauer et al. 2022 (Graz, 100 procedures, minus 12.2 millimetres, plus 5.5 by day 7), days 3 and 7 after Ulu 2025 (22.4 and 29.5 millimetres), days 2 and 7 after Jaiswal 2025 (26.1 and 36.6). Baseline assumed to be 40 millimetres; day 14 is an expected value based on the professional societies (“a few days”), not a measurement. Surgery on both sides, secondary bleeding or wound infection prolong the recovery.

Lockjaw after a numbing injection: the needle in the chewing muscle

The injection for the lower back teeth goes in right next to the medial pterygoid muscle, which closes your mouth. If the needle hits the muscle or a blood vessel, the muscle cramps or a bruise forms, and the next day your mouth won't open properly. There's no fever, just a sore, achy feeling behind your teeth. This is rare, but it's documented: in a case report in the Zahnärztliche Mitteilungen, a patient could only open 20 millimetres, then 40 the next day after warmth, stretching and painkillers; bruises go down within 10 to 15 days. If it hasn't improved after a week, go to the dental practice.

Lockjaw caused by inflammation: wisdom tooth, abscess, tonsils

Inflammation makes lockjaw hot: fever, throbbing pain, growing swelling. The most common trigger is a partially erupted wisdom tooth; the guideline puts pathological changes in wisdom teeth left in place at 20 to over 60%. An abscess at the tooth root can spread into the muscle compartments and needs to be opened the same day. With a peritonsillar abscess at the palatine tonsil, 41% of children in a US analysis had lockjaw, compared with 5% for other throat diagnoses. Lockjaw with fever or trouble swallowing means seeing a dentist or ENT doctor, or going to A&E; there's more in the article on tonsillitis.

Jaw tension from stress: bruxism, tight muscles, CMD

If you wake up with a stiff jaw and clench your teeth when you're stressed, you most likely have overworked chewing muscles, not a locked jaw or an inflammation. Bruxism is common: according to the guideline, around 13% of adults grind their teeth in their sleep and 22 to 31% clench during the day. Shortened, tender chewing muscles then hold your mouth narrower than it needs to be. Things that make it worse: smoking (1.6 to 2.9 times the risk), heavy drinking (1.9 times), more than eight cups of coffee (1.4 times), reflux, sleep apnoea, stress. CMD (craniomandibular dysfunction) is the umbrella term for pain and functional problems in the chewing muscles and jaw joint.

How long does lockjaw last, and does it go away on its own?

Muscular lockjaw almost always goes away by itself: within days to two weeks after an injection, mostly within about a week after wisdom tooth surgery, and with tension as soon as the cause is gone. Inflammatory lockjaw only goes once the inflammation is treated, joint-related lockjaw often won't go without physiotherapy or a splint, and lockjaw after radiotherapy may be permanent (chapter 7). A jaw stuck open never goes back by itself: the muscles hold the joint head in front of the bony ridge, and after four weeks it counts as chronic, when putting it back usually no longer works.

03 Understand

What happens in the jaw joint: joint, muscle, blockage

Three stops explain why the jaw joint slips so easily, why the muscles then hold it in place, and why the clamp usually goes away by itself but the lock never does.

1

The joint glides, it doesn't just rotate

The jaw joint is the most mobile joint in the body: when you open your mouth, the joint head first rotates in its socket and then glides forward with the cartilage disc onto the joint bump. In a wide yawn, it sits right at the front edge. Opening three fingers wide needs both movements; if one gets stuck, your mouth gets stuck.

2

The lock: the head jumps over the edge

If the joint head slips past the bump, the closing muscles don't pull it back but wedge it in place in front of it; the guideline calls this a fixed dislocation. The longer it stays there, the harder the muscles tense, and the harder it is to put back. So the rule is: have it put back in place straight away, and never push it yourself.

3

The clamp: protection that stays too long

Swelling, bruising or inflammation next to the chewing muscles triggers a protective reflex: the muscle shortens and keeps your mouth shut so nothing hurts. That makes sense for days, not for weeks. Warmth, gentle stretching and chewing soft food tell the muscle it can let go; force tells it the opposite.

04 What to do

Lockjaw: what to do. First aid when your mouth won't open or close

The first question isn't “which exercise”, but “open or closed”. If your mouth won't close any more, it's a stuck-open jaw: don't force anything, get it put back. If it won't open, the cause decides whether warmth and stretching are enough or whether you need to go to the practice today; the warning signs are listed below.

Releasing a stuck-open jaw: why you shouldn't put it back yourself

There are guides online for putting your jaw back yourself. The guideline describes the same manoeuvre, but with a bite block, double gloves and a helper holding the head, and it lists what can go wrong: bite injuries to the thumbs, a fractured joint head, or a fracture shifting after a fall or a blow. Every failed attempt makes the muscles tense up harder. A fresh lock can usually be put back in seconds at the practice, without anaesthetic.

Dislocated jaw: what to do straight away

Don't try to pop it back in yourself, don't bite down, don't push against it. Keep your mouth relaxed, dab away any saliva and don't eat anything. Get to a dental practice, oral surgeon, ENT or A&E today. After a fall or a blow, always go to hospital, because a fracture has to be ruled out.

Dislocated jaw: what to do and what the practice does

A short examination (with an X-ray after an injury), then the Hippocratic manoeuvre: the doctor places their thumbs next to the lower molars and their fingers under the lower jaw, then presses first down, then back, and the joint head slides back into place. According to a Chinese study, it's quicker and less painful when you're lying down. If that doesn't work, muscle relaxants are added, and rarely a short general anaesthetic. After three to four weeks, surgery is usually the only option left. Afterwards: a head-and-chin bandage for two to three days, soft food, and no opening wide for weeks (chapter 5).

Easing a locked jaw: rest, warmth, gentle stretching

For a locked jaw after surgery, an injection or muscle tension, follow a three-step plan. First, rest: no force, no prying it open; every jolt of pain makes the muscle tighten more. Then cold or warmth, depending on the phase: in the first two days after surgery, Universitätsmedizin Mainz and DGZMK recommend damp, cold compresses; heat and saunas stay off limits for seven days after surgery. For a muscular lockjaw without a wound, warmth is right from the start: 15 to 20 minutes, two to three times a day. Then gentle stretching: after surgery from day 3, and never beyond the pain threshold.

Woman carefully stretching her jaw with thumb and index finger in front of a mirror, a warm pillow resting against her cheek
Warmth, then stretching: thumb on top, index finger below, gently apart, hold for five seconds. It can pull, but it shouldn't hurt.

Ibuprofen helps with pain and swelling. You can buy it over the counter up to 1,200 milligrams in 24 hours, and shouldn't take it for more than four days without medical advice. A Cochrane review found insufficient evidence for painkillers in jaw joint problems: they ease the pain, but they don't release anything. Muscle relaxants are prescription only.

Warning signs: get seen today

Fever; swelling on the cheek or neck that keeps growing hour by hour; difficulty swallowing; numbness that stays after the anaesthetic has worn off; bleeding again despite 30 minutes of pressure; no improvement after a week, or getting worse again from day 3; a locked jaw for over two weeks with no trigger. If any of these apply, go to a dental practice, oral surgeon or ENT today. If you're struggling to breathe, call 112.

Lockjaw exercises: four cards for at home

The exercises come from instructions that clinics give their patients: Klinik Birshof, Reha Bad Hamm, two British university hospitals and the patient guideline on oral cancer. They all follow the same rules: slowly, without pain, without clicking, and stop as soon as it's more than a gentle pull. A review of 48 studies found small to medium effects for exercises in jaw joint problems, best combined with manual therapy.

Exercises

Four exercises for lockjaw

Slowly, without pain, without clicking. After surgery, start with exercise 1 from day 3, and only use your fingers and warmth once the wound is calm.

1
Active mouth openingfrom day 3 · 1 minute
  • 10 reps
  • hold for 5 seconds
  • up to 10 times a day
  1. Sit upright with the tip of your tongue resting loosely behind your upper front teeth.
  2. Open your mouth as far as it goes without pain, straight down, without your chin drifting to the side.
  3. Hold for five seconds, close slowly, relax briefly.
  4. Repeat ten times; then slowly slide your lower jaw to the left and right five times, five seconds each.

Practise in front of a mirror: if your chin drifts to the side, open less wide. It can pull, but it shouldn't hurt.

2
Finger stretchonce the wound is calm · 2 minutes
  • 3 to 5 stretches
  • hold for 5 to 30 seconds
  • 3 to 5 times a day
  1. Wash your hands. If you don't have a surgical wound, put warmth on your cheek for 15 minutes first.
  2. Place your thumb on the edge of your upper front teeth and your index finger on the lower ones, crossed like scissors.
  3. Push gently apart until you clearly feel a pull, but no pain. Hold for five seconds, building up to 30 seconds over time.
  4. Let go, relax your jaw, and repeat three to five times.

Stop rule: pain, clicking or trembling means too much. Never use spoons, bottles or pieces of wood as levers.

3
Chewing muscle massageany time · 3 minutes per side
  • circular motion, gentle pressure
  • 30 seconds to 3 minutes
  • 2 to 3 times a day
  1. Clench your teeth briefly and touch your cheek: the muscle that tightens is the masseter. Then relax.
  2. With your index and middle finger, stroke over the muscle in circles from the cheekbone downwards, with a light pull, without digging in.
  3. Do the same movement at your temple, where you feel movement when you bite down (temporalis muscle).
  4. Hold tender spots with steady pressure for two to three minutes, until they ease off.

Warmth beforehand or a warm shower makes the massage more effective. After surgery, don't massage over the wound.

4
Jaw relaxation in everyday lifeall day · 10 seconds
  • Lips together, teeth apart
  • Tongue on the roof of your mouth
  • at every reminder point
  1. Close your lips and leave a small gap between your teeth: they only touch when you chew and swallow.
  2. Rest the tip of your tongue on the roof of your mouth, behind your upper front teeth, without pressure.
  3. Breathe out, let your lower jaw go heavy, and drop your shoulders.
  4. Check in five times a day: on your phone, in the car, at your screen. A dot sticker on your monitor helps you remember.

The bruxism guideline recommends exactly this kind of self-observation to counter daytime clenching; stickers as reminders are explicitly mentioned there.

Based on the exercise sheet from Physiotherapie Klinik Birshof (Hirslanden), the CMD exercise sheet from Reha Bad Hamm, the stretching programmes from Cambridge University Hospitals and Worcestershire Acute Hospitals (NHS), the patient guideline on oral cancer and the S3 guideline on bruxism. If your jaw is stuck open, do none of these exercises; after it's been put back, only do what your practice clears.

05 Eating

Eating with a locked or tight jaw: what fits through the gap

Whether your mouth opens two fingers wide or just one, the question is the same: what fits through the gap without you having to open wide, bite off a piece or chew hard? Three rules from the professional societies: soft or liquid (the DGFDT advises steering clear of bread rolls and steaks when your chewing muscles hurt), lukewarm rather than hot (the oral surgeons: "soft, not-too-hot food") and small (the MSD Manual: after a dislocation, cut food into small pieces).

What to eat with a locked jaw: the spoon rule

Clinics sort food by the IDDSI texture levels. Levels 3 and 4 (drinkable to puréed) need no biting and no chewing: cream soup, skyr, porridge, mashed potato, scrambled eggs, a drinkable meal. Level 5 needs minimal chewing and no biting, with pieces of 4 millimetres at most: small pasta in sauce, mashed fish, soft mince. Level 6 you chew properly; according to IDDSI, dry bread only comes back once everything else works. The food traffic light sorts by this: you can spoon green straight away, even with a one-finger opening. Amber works small, soft or puréed from two fingers. Red waits for three fingers.

Look it up

Will it fit through a small gap? The food traffic light

Type in a food or filter by group. Green you can spoon or drink straight away, amber works small, soft or puréed from a two-finger mouth opening, and red waits for three fingers and the all-clear.

  • Porridge oatmeal, overnight oats Right awayCook fine flakes until soft and eat lukewarm with a spoon; made with milk instead of water, it has about twice as much protein.
  • Semolina porridge rice pudding, pudding Right awayStir until smooth; more nourishing when cooked with milk; rice pudding only if the grains are completely soft.
  • Plain yoghurt drinking yoghurt, kefir Right awayWithout fruit pieces or seeds; 150 g gives you 5 g protein, Greek yoghurt twice that.
  • Skyr Greek yoghurt, quark Right awaySmooth and cool, with around 10 g protein per 100 g, it's the easiest protein source for spoon-only days.
  • Scrambled eggs softly set Right awayCreamy and lukewarm, not fried dry; two eggs give you 12 g protein. After dental surgery, from day 3 to 4.
  • Toast white bread, milk rolls From 2 fingersCrusts off, soak in milk, cocoa or soup; according to IDDSI, dry bread and toast only count as normal food.
  • Pancakes crêpes, Kaiserschmarrn From 2 fingersSoft, cut into small pieces, with apple sauce; no crispy edges.
  • Rusks crispbread, crackers From 3 fingersHard and crumbly; the crumbs end up in the wound area. Soaked in milk, they work earlier.
  • Muesli granola, grain bread From 3 fingersHard grains and nuts need chewing power; as finely blended porridge, right away.
  • Croissant puff pastry, pretzel From 3 fingersFlaky, crumbly and made for biting into, which is exactly the movement your jaw shouldn't make right now.
  • Cream soup potato, pumpkin, carrot, pea Right awayBlended smooth and lukewarm, with cream cheese or cream for energy; after dental surgery, pass it through a sieve.
  • Broth chicken broth, vegetable broth Right awaySlips down easily and gives you salt and fluid, but almost no energy: 240 ml has 14 kcal. Only as a supplement.
  • Mashed potato mashed sweet potato, polenta Right awaySmooth with no lumps, made with milk and butter; add egg, cheese or quark and it becomes a proper meal.
  • Lentil soup blended pulses, hummus Right awayBlended and lukewarm, it has 9 g protein per bowl; in the wound healing phase, strain it so no skins are left.
  • Noodles pasta, gnocchi From 2 fingersCook until very soft, cut small, use plenty of sauce; twirling spaghetti won't work, but small shapes do.
  • Rice risotto From 2 fingersOnly soft and in sauce, not grainy; as risotto or rice pudding, earlier.
  • Fish salmon, cod From 2 fingersSteamed, it flakes apart under a fork, with 22 g protein per 100 g; no bones, no breadcrumbs; blended into a sauce, right away.
  • Mince bolognese, meatball From 2 fingersFine and braised soft in sauce, pieces 4 mm at most; the meatball can wait.
  • Tofu silken tofu, firm tofu Silken tofu right awaySilken tofu on its own or in a smoothie; firm tofu mashed or blended from two fingers.
  • Chicken breast schnitzel, whole cuts of meat From 3 fingersStringy, needs chewing and jaw strength; finely blended into a sauce or as poultry cream, earlier.
  • Steak tough meat, sausage with skin From 3 fingersLong, hard chewing; the professional society specifically names steak as something your jaw doesn't need right now.
  • Burger sandwich, filled roll From 3 fingersTo bite in, you have to open wide, and that's exactly what your jaw shouldn't do after a dislocation or with lockjaw.
  • Baguette bread crust, bread rolls From 3 fingersHard crust, biting, chewing: three strikes. The soft inside, soaked, from two fingers.
  • Pizza From 3 fingersCrust, biting, hot. As an exception, lukewarm with a soft edge in small pieces from two fingers.
  • Pudding vanilla pudding, jelly Right awayCool and smooth; pudding cooked with milk gives you a bit of protein, jelly almost none.
  • Ice cream vanilla ice cream, milk ice cream, ice lolly Right awayCools your cheek from the inside; choose flavours without nuts, brittle, wafer or biscuit pieces.
  • Apple sauce mashed banana, fruit purée Right awaySmooth and mild, as a spoon snack or stirred into porridge and skyr.
  • Chocolate Right away, let it meltLet a piece melt on your tongue instead of biting it; no nuts or brittle. Cold cocoa always works.
  • Cake sponge cake, muffin From 2 fingersSoft baked goods dunked in milk, without nuts, crumble or crust.
  • Biscuits butter biscuits, waffles From 3 fingersHard and crumbly; soaked in milk, from two fingers.
  • Jelly sweets chewy sweets, toffee, liquorice From 3 fingersTough and a long time to chew; in clinic lists, chewy sweets are right at the top of what has to wait.
  • Chewing gum Only once clearedNon-stop work for your chewing muscles. The professional society for functional diagnostics advises skipping chewing gum if you have pain in the jaw joint or chewing muscles.
  • Crisps popcorn, pretzel sticks, nuts From 3 fingersHard, sharp-edged, with husks: everything that needs chewing power and leaves crumbs behind.
  • Peanut butter almond butter, nut butter Right awaySmooth, stirred in thinly to porridge, shakes or skyr: 96 kcal and 3.6 g protein per tablespoon. Not in sticky amounts.
  • Banana mashed Right awaySoft and mild, mashed with a fork or in a shake.
  • Avocado mashed Right awayCreamy and rich in energy, 160 kcal per 100 g; on its own with a pinch of salt or in a smoothie.
  • Berries strawberries, blueberries, raspberries Right away, strainedBlended and pushed through a sieve, right away; whole berries with seeds wait after dental surgery.
  • Melon mango, peach, ripe pear From 2 fingersVery soft small pieces, or blended, right away.
  • Apple raw, biting in From 3 fingersBiting and chewing; grated or as sauce, right away.
  • Raw carrot pepper, celery, raw veg From 3 fingersVery hard. Cooked soft and puréed, it's fine straight away, and carrot purée with butter is even nourishing.
  • Vegetable purée pumpkin, spinach, broccoli Straight awayCook until soft, purée, then add butter or cream cheese. Spinach provides calcium.
  • Tomato cucumber, lettuce From 2 fingersWithout skin and seeds, in small pieces. Lettuce leaves are tough and can wait.
  • Sweetcorn whole peas, whole pulses From 3 fingersThe husks get stuck between your teeth and in the wound area. Puréed and sieved, they're fine straight away.
  • Water still water, lukewarm herbal tea Straight awayThe most important drink, in small sips. The DGE gives 1.4 litres from drinks per day as a guideline.
  • Milk cold cocoa, buttermilk, kefir Straight awayEnergy, protein and calcium in one glass: 250 ml of whole milk has 153 kcal and 8 g protein.
  • Soya drink oat drink, almond drink Straight awaySoya drink with added calcium gives you about as much protein as milk. Oat and almond drinks give you much less.
  • Smoothie shake, protein shake Straight awayBlended smooth, with no seeds or bits. Add yoghurt, nut butter or whey and it becomes a meal.
  • Drinkable meal nutritional drink Straight awayReplaces a whole meal without any chewing: protein, fat, carbs, vitamins and minerals from the bottle, cold and mild.
  • Orange juice fruit juice, spritzer Not on the fresh woundThe acid stings in the wound area after dental surgery. Otherwise it's fine, and with 124 mg of vitamin C per glass it's even useful.
  • Coffee black tea 24 hours after surgeryAfter procedures in the mouth, skip it for the first 24 hours, then have it lukewarm. According to the bruxism guideline, more than eight cups a day raises the risk of teeth grinding.
  • Cola lemonade, energy drink, sparkling water After the wound phaseAvoid fizz and sugar on the fresh wound. Oral and maxillofacial surgeons explicitly name cola for the first 24 hours.
  • Alcohol beer, wine After the wound phaseOff-limits for at least 24 hours after procedures, and for a week after a broken jaw. Heavy drinking doubles the risk of teeth grinding.
  • Cottage cheese ricotta, cream cheese Straight awaySoft, eaten plain or stirred into soup and purée. Cottage cheese gives you 12 g protein per portion. Purée it during the wound phase.
  • Whey protein powder Straight awayStirred into milk or a shake, it gives you 23 g protein per portion. The easiest way to boost spoonable food.
  • Hard-boiled egg egg salad From 2 fingersMashed fine with yoghurt or mayonnaise as an egg cream, it's fine straight away. In quarters from two fingers.
  • Soft cheese Camembert, Brie From 2 fingersWithout the rind, in small pieces. Melted into soup and purée, it's fine straight away.
  • Ham cold cuts, sausage From 2 fingersSliced very thin and in small pieces. Sausage with skin and salami are tough.
  • Tuna tinned From 2 fingersPuréed with yoghurt or mayonnaise into a cream, it's fine straight away, with 16 g protein per tin.
  • Hard cheese Gouda, Parmesan in a block From 3 fingersTough in a block. Grated and melted into soup or purée, it's fine straight away, with 700 mg calcium per 100 g.
  • Mozzarella From 3 fingersRubbery and tough. Melted in a sauce, it's fine from two fingers.
  • Chickpeas beans, whole lentils From 3 fingersWhole, they need chewing. As hummus or puréed lentils they're fine straight away, with 18 g protein per bowl.

Eating after jaw reduction: soft, small, don't open wide

After a locked jaw has been put back in place, the joint is irritated and the capsule is stretched. The S3 guideline recommends soft food and no wide opening "for a few days"; the MSD Manual says: don't open wide for six weeks, cut food small, and put a fist under your chin when you yawn. For your plate: no biting into an apple, no burger, no baguette; everything is made small or comes off a spoon. Cream soup with cream cheese, skyr with fruit purée, mash with scrambled egg cover your energy and protein without your jaw opening wider than two fingers.

With a tight jaw, many people live on broth, apple sauce and pudding for days because it fits through the gap. The consistency is right, but there's almost no protein. Skyr, scrambled egg, cream soup with cream cheese or a drinkable meal slide down just as easily and give your body what it needs for muscle and healing.

Joerg Hauke, Nutrition expert, specialist review of this article

Eating with a broken jaw: four to six weeks of liquids

With a wired lower jaw fracture, your mouth stays shut so it can heal: according to British hospital leaflets, about six weeks, four of them purely liquid, then a "liquid-pureed" diet. You eat with a syringe, teaspoon or straw placed behind the teeth, in six to eight small portions totalling 1,800 to 2,500 kilocalories a day. Why so much: in a British study, six weeks of wiring cost 4.5 kilograms on average, 3.3 kilograms of it lean mass. Drinkable meals and cream soups with cheese are the building material for healing here; the straw is allowed because there's no open wound in a tooth socket.

Soft spoonable food for a locked jaw: cream soup, skyr with fruit purée, mashed potato with scrambled egg and a shake
What fits through the gap: cream soup, skyr with fruit purée, mash with scrambled egg and a shake. All from a spoon or a glass, nothing to bite into.

After dental surgery, jaw rules and wound rules apply at the same time: soft food that isn't too hot, no coffee, no cola and no alcohol for 24 hours, no smoking for several days. Nothing that can get stuck in the wound: crumbs, grains, seeds. The straw stays in the cupboard for a week: the suction can pull the blood clot out of the socket, which according to the Cleveland Clinic happens in 2 to 5% of all tooth extractions. More in the article on wisdom tooth surgery.

06 Nourish

Stay nourished when your mouth only opens a crack

A tight jaw lasts days, a broken jaw six weeks. The problem is rarely the consistency but the amount: tea, broth, apple sauce and pudding fit through the gap, but they give you hardly any energy or protein. In a British study, wired jaws cost 3.3 kilograms of lean mass in six weeks. The ESPEN guideline: if you can't eat for more than five days, or stay below half your needs for more than seven days, you get nutrition therapy "without delay", starting with oral nutritional supplements.

Why tea and rusks aren't enough

The typical tight-jaw day, worked out: tea, six soaked rusks, apple sauce, broth, banana, pudding. That's around 590 kilocalories and 11 grams of protein: a third of what the DGE gives for a woman (1,800 kcal), a fifth of the protein for 70 kilograms (56 grams). ESPEN target for people who are healing: 1.0 to 1.5 grams per kilogram. The well-nourished day has the same consistency, just with more in it: the three recipes below plus porridge with milk and scrambled egg on mash, together around 2,200 kilocalories and over 100 grams of protein. Every soft portion needs protein and a bit of fat.

Three meals that fit through a finger-wide gap

1
Mid-morning: banana-oat shake with whey5 minutes · cool or lukewarm · from the glass
  • ≈ 480 kcal
  • 36 g protein
  • 440 mg calcium
Zutaten
  • 250 ml whole milk (or soya drink with calcium)
  • 1 banana (100 g)
  • 30 g fine rolled oats
  • 30 g whey protein, neutral or vanilla
  • 1 tsp honey
Zubereitung

Let the oats soak in the milk for five minutes, then blend everything finely for at least a minute until no bits of flake are left. Drink from the glass in small sips or eat with a spoon. Without whey: use 150 g Greek yoghurt instead of the powder, which gives you 28 g protein.

2
Lunch: potato and leek cream soup with cream cheese and Gouda30 minutes · lukewarm · 2 portions
  • ≈ 540 kcal
  • 17 g protein
  • 330 mg calcium
Zutaten
  • 400 g potatoes, peeled
  • 150 g leek, white part only
  • 500 ml chicken or vegetable stock
  • 100 g cream cheese
  • 100 ml whole milk
  • 10 g butter
  • 50 g Gouda, grated
  • Salt, nutmeg
Zubereitung

Sweat the leek in butter until soft, add the diced potatoes and stock, and simmer for 20 minutes. Stir in the cream cheese, milk and Gouda, blend until smooth, and after dental surgery press it through a sieve. Let it cool to drinking temperature; the second portion keeps for two days in the fridge.

3
Afternoon: skyr and berry cream with peanut butter5 minutes · cool · by the spoon
  • ≈ 300 kcal
  • 25 g protein
  • 59 mg vitamin C
Zutaten
  • 200 g skyr (or Greek yoghurt)
  • 100 g strawberries, fresh or thawed
  • 1 tbsp honey
  • 1 tbsp smooth peanut butter (15 g)
Zubereitung

Purée the strawberries and press them through a sieve so no seeds are left. Stir smooth with the skyr, honey and peanut butter, then spoon it up cool. In the wound phase after dental surgery, use a mashed banana instead of the berries.

Nutritional values rounded per portion based on USDA FoodData Central SR Legacy (whole milk 171265, banana 173944, oats 173904, whey 173180, honey 169640, potatoes 170440, leek 168426, stock 174536, cream cheese 173418, Gouda 171241, strawberries 167762, peanut butter 172470; skyr based on Greek yoghurt 170894, manufacturer values are usually slightly higher). All three without biting, without chewing, without crumbs.

Drinkable meal: On days when even spooning is too much effort, it's the simplest solution: from the glass or with a straw behind the teeth (allowed after a broken jaw, after a tooth extraction only after a week), cold, mild, no chewing, and unlike tea or apple sauce, a complete meal with protein, fat, carbohydrates, fibre and micronutrients.

Woman with a swollen cheek drinking a cold drinkable meal from a glass in small sips in the kitchen
When your mouth only opens a crack: cold, mild, in small sips. A drinkable meal replaces the meal you'd otherwise miss.

British hospital leaflets recommend six to eight nutritious drinks a day and, after a week on liquids, a vitamin supplement, because a liquid diet can be "very filling and low in energy"; a drinkable meal solves both with one bottle. Unlike medical nutrition drinks, it's an ordinary food. Drink it cold, in small sips; vanilla and natural are the mildest flavours.

Ready-to-Drink 6 x 400 ml
From the Saturo range

Drinkable meal: a complete meal in a bottle

36 g protein and 400 kcal per bottle, plus 26 vitamins and minerals, vegan. Protein contributes to the maintenance of muscle mass. Reference intake for protein: 50 g per day (NRV). Drink it cold, mild, no chewing. Vanilla and Natural are the mildest flavours.

36 gProtein
400kcal
26Vitamins & minerals
LiquidNo chewingA complete meal from the glass, fits through any gap
Choose a flavour
54,83 krper meal
Drinkable meal · Cocoa54,83 kr per meal ·
07 If it doesn't go away

When it keeps locking: CMD, grinding, recurrent stuck-open jaw

Jaw clicks and locks: the displaced cartilage disc

Around a third of adults know the click when opening their mouth. Usually it's harmless: the cartilage disc sits slightly too far forward, and the joint head snaps back onto it with a click. Only what hurts gets treated. It's different when the click disappears and your mouth stops at two to three centimetres: then the disc is blocking the joint head (disc displacement without reduction), with pain in front of the ear and a chin that drifts towards the affected side. That one's for the dentist: splint, physiotherapy, sometimes joint lavage.

Jaw tension from stress and teeth grinding

The most common long-term lock is the muscular kind: clenching during the day, grinding at night, and a jaw in the morning that needs to warm up first. The drivers are listed in chapter 2 (smoking, alcohol, coffee, reflux, sleep apnoea, stress); tooth position is not a main factor. What helps is a package: awareness ("lips together, teeth apart", exercise 4), heat and massage before bed, relaxation techniques and the bite splint for the night. What doesn't help: chewing gum as "training" and stretching programmes for night-time grinding, where the guideline found more episodes.

CMD treatment and health insurance: If you've lived with a locked jaw, clicking and chewing-muscle pain for weeks, you'll end up with a CMD diagnosis. The initial examination and the classic bite splint are covered by statutory health insurance, the functional analysis usually isn't, physiotherapy is available on a dentist's insurance prescription, and you pay for Botox yourself. CMD treatment takes months and starts with the simple things.

At a glance

CMD and locked jaw: treatments compared

What guidelines and the specialist society for functional diagnostics think each measure can do, and what statutory health insurance covers.

WhenWhat the guidelines sayHealth insurance
Bite splintGrinding, chewing-muscle pain, jaw-joint lockStandard measure; protects the teeth, temporarily reduces grinding activityYes, the classic splint; special types privately
Self-exercises, heatMuscular lock, tensionAwareness and relaxation recommended; exercises with a small to medium effectFree
Physiotherapy, manual therapyPersistent lock, muscle and joint painRecommended, usually with heat or cold; evidence low to moderateYes, on a dentist's prescription for jaw-joint damage
Relaxation trainingClenching during the day, stress as a triggerRecommended for awake bruxism; mixed evidencePartly via prevention courses
PainkillersAcute painIbuprofen short term; Cochrane found insufficient evidence for CMD painOver the counter, you pay
Botulinum toxinSevere bruxism, recurring jaw dislocationCan be considered; reduces pain and muscle strength, not the number of episodes; off-labelNo, usually private
Joint lavage (arthrocentesis)Joint lock from a blocked cartilage discAccording to Charité, often the first surgical step for joint causesYes, as a medical service with an indication
Functional analysisBefore splints and bigger proceduresDiagnostics of chewing function with measurementsNo, private; the initial examination is covered

Based on the S3 guideline on bruxism (2019), the S3 guideline on jaw joint dislocation (2022), the Cochrane review on painkillers for CMD (2010), the overview by Armijo-Olivo and colleagues (2016), the DGFDT, Charité oral and maxillofacial surgery, the consumer advice centre (as of June 2024) and the G-BA's remedies guideline for dentists. Coverage can change; if in doubt, check with your insurer first.

When the stuck-open jaw comes back: habitual dislocation

In around 20% of cases the jaw gets stuck again, and this can turn into a habitual dislocation, where the jaw jumps out even during a normal yawn. Conservative treatment: painkillers, physiotherapy, splint, and limiting how wide you open for four weeks. Minimally invasive: autologous blood injection into the joint has the best evidence and leaves about 80% symptom-free for twelve months; botulinum toxin in the lateral pterygoid muscle stops the lock-ups for at least five months, off-label and private. Surgical: removal of the articular eminence (eminectomy) or the Dautrey procedure (locking plasty), with only 4% repeat lock-ups in a study of 75 patients.

Rare causes: After radiotherapy to the head and neck, the chewing muscles scar: 25% developed a locked jaw, 5% with modern technique; in the Swedish ARTSCAN study, one in four still had a clear restriction after five and a half years. Early training (jaw stretching devices gained 9.5 millimetres on average) and nutritional therapy help here. Tetanus often starts with a locked jaw and stiff neck, three days to three weeks after a contaminated wound. Medication for psychoses, depression and nausea rarely triggers an acute spasm, which an antidote ends within minutes. A locked jaw with no trigger that gets worse over two weeks should be checked out.

Relax at night, stay aware during the day

Heat and three minutes of massage in the evening, then exercise 4. Check your coffee after lunch and your alcohol in the evening, as both make grinding worse. Skip the chewing gum while your muscles hurt. If you're still waking up with a locked jaw after four weeks, talk to your dentist about a splint.

08 Look it up

Common questions about lockjaw and trismus

What's the difference between trismus and a jaw lock?

With a locked jaw (trismus), your mouth barely opens, or doesn't open at all, because the chewing muscles are cramped or the tissue is swollen. With a stuck-open jaw (dislocation), your mouth won't close because the joint head has jumped in front of the joint eminence. A locked jaw usually passes on its own, while a stuck-open jaw has to be put back in place.

How do you get rid of a jaw lock?

Only by having it put back in place at a dental practice or A&E, never by yourself. The doctor places their thumbs next to your lower molars and presses first down, then back (Hippocratic manoeuvre). With a fresh lock, this usually takes seconds and doesn't need an anaesthetic. After three to four weeks, surgery is usually the only option.

How long does trismus last after wisdom tooth surgery?

Trismus after surgery is normal. In a study from Graz, the mouth opened 12 millimetres less on the first day. By day 7, half of that had come back, and after ten to fourteen days three fingers usually fit in again. If it hasn't improved after a week, or if you have a fever, go to the practice.

Which doctor should I see for a jaw lock?

For a jaw lock, go to a dentist, oral and maxillofacial surgery, an ENT doctor or A&E on the same day. After a fall or a blow, always go to hospital. For trismus, see a dentist. If you have a fever or trouble swallowing, go today. The 116117 line doesn't refer you to dentists. At night, the emergency dental service can help. If you struggle to breathe, call 112.

Is trismus dangerous?

Usually not: after surgery, an injection or muscle tension, it goes away. It becomes dangerous when it's a sign of an infection that is spreading: fever, growing swelling on your cheek or neck, trouble swallowing, difficulty breathing. An abscess could be behind it, and that needs hospital straight away. Get it checked if trismus has no obvious cause and gets worse over more than two weeks.

Which medication helps with trismus, and is ibuprofen suitable for jaw joint pain?

Ibuprofen is the usual remedy for pain and swelling: available without a prescription up to 1,200 milligrams in 24 hours, for no longer than four days without medical advice, and according to Embryotox not from the 28th week of pregnancy. A Cochrane review found insufficient evidence for painkillers in jaw joint problems: they ease the pain, but they don't fix the cause.

Which sleeping position relaxes the jaw?

There's no study that recommends a particular position. What makes sense is anything that doesn't put strain on your lower jaw: don't sleep with your hand or fist under your jaw, and avoid a pillow that pushes it to one side. According to the bruxism guideline, an evening routine with warmth, massage and relaxation helps more, and a bite splint helps if you grind your teeth at night.

Which health insurer covers CMD treatment?

Every statutory health insurer covers the initial examination and the standard bite splint for jaw joint disorders, according to the consumer advice centre. Special types of splint are private. For jaw joint damage, your dentist can prescribe physiotherapy on an insurance prescription. You usually pay for the detailed functional analysis and botulinum toxin yourself.

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Gregor Aßlaber
Gregor AßlaberAuthor · Editor, Saturo

Has been writing for Saturo since 2019 about nutrition, nutrients and how to make good nutrition work in everyday life.

Joerg Hauke
Joerg HaukeFachliche Prüfung · Nutrition expert

Hat diesen Artikel am 22. September 2026 auf fachliche Richtigkeit geprüft. This content doesn't replace medical advice.