Can sleep apnea cause teeth grinding?

You wear your splint every night, you have done the physio exercises, and still you wake up with a tight jaw and a heavy head. If that is you, you are in good company. People with jaw pain often try one treatment after another, while the way they breathe at night rarely gets asked about.

This page goes with my reel on breathing and clenching. I explain what research says about sleep apnea and teeth grinding, where the evidence is still thin, and what you can notice yourself before talking to your dentist or doctor. You also get the daytime rest position I show in the video.

In short

Sleep apnea and night-time grinding often show up in the same people, and one theory says jaw muscle activity may help reopen a narrowing airway. That theory has not been proven, and reviews conclude that a causal link in adults cannot be confirmed so far (Pauletto et al., 2022).

• If you wake with a tight jaw, a dry mouth or a headache, tell your dentist or doctor, because a sleep check can be worth it.
• A splint protects your teeth but does not change why your jaw is working at night.
• Sleep apnea can only be diagnosed with tests, usually at a sleep clinic.

What is sleep apnea, and how does it show up?

The NHS describes sleep apnoea as breathing that stops and starts while you sleep. At night that can mean gasping, snorting or choking noises, waking up a lot and loud snoring. During the day you may feel very tired, find it hard to concentrate, have mood swings or have a headache when you wake up (NHS, 2026).

It has been linked to obesity, a large neck, getting older, alcohol, smoking, large tonsils and sleeping on your back (NHS, 2026). Because you are asleep when it happens, someone else often notices it first, and the NHS says it can help to bring that person along to the GP (NHS, 2026).

Are sleep apnea and teeth grinding connected?

They often travel together. A 2023 systematic review reported that sleep bruxism and sleep apnea occur together in roughly 21 to 41 per cent of cases, and that the two share risk factors such as older age, obesity, smoking and alcohol (González González et al., 2023). The NHS also lists sleep problems like snoring and sleep apnoea among the things teeth grinding is often linked to (NHS, 2026).

Whether one causes the other is a different question. A scoping review in the journal Sleep found no significant association between the two in most adult studies and concluded that a relationship in adults cannot be confirmed yet (Pauletto et al., 2022). A 2024 meta-analysis of 14 studies also found that people with sleep apnea were no more likely to grind than people without it, while warning that the quality of the studies was low (Błaszczyk et al., 2024).

So the honest answer is that the two overlap in many people, and the reason is still open.

Why would your jaw work harder when you breathe badly at night?

This is the idea behind my reel. When the airway narrows during sleep, one hypothesis is that the jaw muscles switch on, and may move the jaw slightly forward, to help reopen it. This has not been proven. Bursts of rhythmic jaw muscle activity may follow brief arousals from breathing events, and some researchers describe this activity as a possible way of reopening the airway (González González et al., 2023). The same review found that this jaw activity came before a breathing event in only a quarter of people who grind, so the timing does not clearly fit (González González et al., 2023).

The international bruxism consensus fits this view in one respect. It treats bruxism in otherwise healthy people as a behaviour rather than a disorder, one that can be a risk factor and sometimes a protective factor for certain consequences (Lobbezoo et al., 2018).

It is a plausible explanation that researchers are still testing. The same review notes a second hypothesis, that the activity helps lubricate the throat while saliva flow is low at night (González González et al., 2023).

Why does your jaw still hurt when you wear a splint?

A splint sits between your teeth and takes the wear. That protects enamel and fillings, and it is often a sensible choice. What it does not do is change the reason your jaw muscles are active at night. If that reason has to do with how you breathe in your sleep, the muscles can keep working hard behind the splint, and you can still wake up sore.

Our page on night guard alternatives goes through other options, and the teeth grinding hub explains the habit itself.

Try it: the morning check and the daytime rest position

These are the two things I show in the reel. The first is a short observation you do for a week. The second is a position you can practise during the day.

Morning check. For seven mornings, take ten seconds before you get up and note:

1. Was your mouth open when you woke up?
2. Do your mouth or throat feel dry?
3. Do you have a headache?
4. Does your jaw feel tight or tired?
5. Has anyone told you that you snore, gasp or seem to stop breathing?

If several of these come up again and again, write them down and mention them to your dentist or doctor. A sleep check can be worth it. You cannot tell from this list whether you have sleep apnea, and it is not meant to.

Daytime rest position. This is a position many physiotherapists teach for a busy jaw.

1. Close your lips gently, without pressing them together.
2. Let your tongue rest flat against the roof of your mouth, with the tip just behind your upper front teeth.
3. Let your teeth drift apart so there is a small gap between them.
4. Breathe slowly through your nose and let your jaw hang.
5. Hold this for a few breaths, then go back to what you were doing.

In the moment

When you notice your teeth touching during the day, run through the rest position once. In the app, the daily tooth contact check gives you a regular moment to ask yourself whether your teeth are touching and to let them drop apart.

Long term

Keep the morning notes for a week or two so you have something concrete to show. The NHS suggests sleeping on your side, keeping regular sleep times and avoiding alcohol close to bedtime for sleep apnoea (NHS, 2026). The evening wind-down routine in the app gives your jaw a calm few minutes before bed, and the symptom check-ins let you see how your jaw has felt over the weeks.

How JawBuddy helps

JawBuddy is a digital companion for guided jaw exercises and self-management. It builds a personal plan from your symptoms and history, with guided exercise videos that show the muscle being worked, a daily tooth contact check, an evening wind-down routine and check-ins for pain and stress.

It does not diagnose sleep apnea and does not replace a sleep study. JawBuddy does not replace emergency care or an individual diagnosis from a qualified healthcare professional. If you want to try it, download the app on the App Store or Google Play.

When should you see a doctor?

Emergency (call 999, or 911 in the US): chest pain, sudden severe breathlessness, or someone cannot be woken properly.

Urgent (contact your GP soon, or NHS 111): you feel so sleepy in the day that you nod off while driving or nearly do. The NHS says that if sleep apnoea with excessive sleepiness is confirmed, you must not drive until symptoms like feeling very tired are under control (NHS, 2026).

See a GP: someone has seen your breathing stop and start while you sleep, you make gasping, snorting or choking noises at night, or you always feel very tired during the day (NHS, 2026). A GP can refer you to a sleep clinic, where devices record your breathing and heartbeat overnight. Without treatment, sleep apnoea has been linked to high blood pressure, stroke, type 2 diabetes, heart disease and accidents caused by tiredness (NHS, 2026).

For jaw pain itself, our jaw pain page helps you sort out what is going on, and can teeth grinding cause headaches? covers the morning headache side.

Your jaw might be telling you about your nights

If you have tried a lot and your jaw still wakes up tired, looking at your breathing is a reasonable next step. Do the morning check this week and bring your notes to your next dentist or GP appointment.

For the wider picture, read our TMJ disorder guide.