Roughly one person in five grinds or clenches during sleep, according to a 2024 meta-analysis in the Journal of Clinical Medicine, and a similar share do it while awake. Many of them are not aware of it. Bruxism is usually discovered indirectly: a partner hears it, a back tooth cracks, a filling keeps breaking, or a dentist notices the wear at a routine visit.
This guide covers how to recognise it, what drives it, how it is assessed, the treatment options and what affects the cost.
Two habits share one name
Bruxism is repetitive jaw muscle activity that involves clenching or grinding the teeth, or bracing the jaw. Clinicians separate it into sleep bruxism and awake bruxism because the two behave differently.
Sleep bruxism happens without awareness. It is often rhythmic and can be noisy, and because you are asleep you cannot simply decide to stop. Awake bruxism is usually silent clenching or bracing while you concentrate, drive, use a screen or feel tense. Because you are conscious, it can often be reduced with practice once you learn to notice it.
Some people have one form, some have both. The split matters for treatment: a night splint is aimed at sleep grinding, while daytime clenching responds better to habit awareness and attention to tension during the day.
The 2024 review by Zieliński and colleagues pooled studies published over two decades and estimated global prevalence at about 21% for sleep bruxism and 23% for awake bruxism. The authors noted that Australia could not be analysed separately because there was not enough data, so local figures remain uncertain.
What you might notice yourself
Morning is when sleep bruxism tends to show. The muscles at the sides of the jaw and at the temples can feel tight or tired on waking, and a dull, pressing headache around the temples may ease over the morning as the muscles relax. That pattern of pain that is worst on waking and improves through the day is a useful clue.
Teeth can give other hints. Sensitivity to cold may appear as enamel thins. A filling or crown may come loose, or a back tooth may hurt sharply when you bite on something and then release. Clicking, tenderness in front of the ear or difficulty opening wide in the morning can suggest the jaw joint is under strain too. And the most direct sign of all is a partner who tells you they can hear grinding at night.
What a dentist sees that you cannot
Several signs of bruxism are only obvious from the outside. Front teeth lose their natural shape and become flat across the biting edges, sometimes with small chips at the corners. Back teeth develop flat, shiny facets where they meet. There may be fine cracks in enamel, repeatedly fractured restorations, or notches near the gumline on canines and premolars.
Soft tissues can show it as well. A scalloped edge along the sides of the tongue or a white ridge along the inside of the cheek suggests teeth pressing into them, often overnight. Enlarged, tender jaw muscles are another finding. None of these signs proves bruxism on its own, which is why the history matters as much as the examination.
Several drivers, rarely just one
There is seldom a single cause. Most people have a mix of contributing factors, and the balance differs from one person to the next.
Stress and tension
Psychological stress is the factor most often linked with bruxism, especially daytime clenching. Many people first notice symptoms during a demanding stretch at work, a family illness or other prolonged pressure.
Disturbed breathing during sleep
Sleep bruxism and obstructive sleep apnoea often occur together. A 2026 umbrella review in Sleep Medicine (Pereira and colleagues) found that adults with sleep apnoea appear more likely to grind at night, possibly through brief arousals from sleep, although the evidence was of low quality and cause and effect remain unclear. Loud snoring, pauses in breathing that someone has witnessed and heavy daytime tiredness are reasons to see your GP, whatever is happening with your teeth.
Alcohol, nicotine, caffeine and some medicines
Alcohol, smoking and heavy caffeine use have all been associated with more sleep grinding, and certain antidepressants and other medicines that act on the nervous system have been linked with it as well. If clenching started or worsened after a new medicine, raise it with the prescribing doctor rather than stopping it yourself.
The bite and dental work
Older thinking blamed the bite for most grinding, and that idea is now largely set aside. Bite irregularities are not regarded as a main cause, but a new filling or crown that sits slightly high can make jaw muscles uncomfortable and is worth having checked.
Children
Grinding is common in young children and often settles as the adult teeth come through. Persistent grinding with marked wear, poor sleep or snoring is worth mentioning to your dentist or OHT and your GP.
How bruxism is confirmed
There is no single test. In the dental chair, assessment combines a history (sleep quality, snoring, headaches, stress, caffeine, alcohol and medicines, and anything a partner has noticed) with an examination of the teeth, restorations, jaw muscles, joints, opening range, tongue and cheeks. Photographs and a digital scan create a record so that wear can be compared over time.
When sleep apnoea is suspected, or grinding is severe and not responding to treatment, a GP can arrange a sleep study. Sleep recording is the most accurate way to measure sleep bruxism, but most people do not need one to start sensible management. Home devices that record jaw muscle activity also exist; they can be useful for tracking but are not a replacement for clinical assessment.
Treatment works on two fronts
Good management usually does two things at once: it protects the teeth from further damage, and it reduces the factors driving the muscle activity. One without the other tends to underperform.
Protecting the teeth
For sleep bruxism, a custom hard occlusal splint is the usual choice. It spreads biting forces and puts a replaceable surface between the teeth, so wear happens to the acrylic instead of enamel or restorations. It is worth being clear about its limits. A Cochrane review (Macedo and colleagues, 2007) found insufficient evidence that splints treat sleep bruxism itself, while suggesting there may be some benefit for tooth wear. In other words, think of a splint as protection rather than a cure.
Different appliances suit different situations:
| Appliance | What it is | Where it fits |
|---|---|---|
| Sports mouthguard | Thick, soft, shock-absorbing guard | Contact sport; not designed for night grinding |
| Boil-and-bite guard from a pharmacy | Thermoplastic guard moulded at home | Short-term stopgap while waiting for assessment |
| Soft or dual-layer lab-made guard | Custom guard with a softer inner layer | Some lighter grinders who cannot tolerate a hard splint |
| Hard acrylic occlusal splint | Custom, rigid splint adjusted to your bite | The standard option for moderate to heavy sleep grinding |
| Front-teeth-only splint | Small splint covering only the front teeth | Selected cases, short term and closely supervised, because unsupervised long-term wear can let teeth move |
Our guide to night guards and occlusal splints goes into the appliances themselves in more detail.
Reducing the drivers
Stress-related and daytime clenching often improve with habit retraining (resting position: lips closed, teeth apart, tongue resting lightly on the roof of the mouth), regular exercise and relaxation practice, and for some people, psychological support such as cognitive behavioural therapy arranged through a GP. Improvements are usually partial, which is why protection is often still needed.
Where sleep apnoea is found, treating it is a medical matter managed with your GP and a sleep physician. Cutting back alcohol in the evening, reducing heavy caffeine intake and stopping smoking address the lifestyle associations. Physiotherapy can help when jaw muscles or joints remain sore.
For a small number of people with severe muscle pain or enlarged jaw muscles that have not settled with other measures, muscle-relaxing injections into the jaw muscles may be discussed. Their effect wears off over months, they are not a first-line option, and they work alongside protection rather than replacing it.
Repairing damage
Worn enamel does not grow back, and cracks can deepen under continued load. Rebuilding worn edges with composite resin, or protecting a cracked tooth with an onlay or crown, is often easier and less costly when done before damage extends further. Our article on cracked tooth syndrome explains what to look for. Grinding can also play a part in sensitive teeth and notching near the gumline, which our guide to receding gums discusses.
What affects the cost
The cost of managing bruxism depends far more on how much damage has already occurred than on the splint itself. An examination with any needed X-rays comes first. A lab-made hard splint usually costs more than a soft guard or a pharmacy guard, and the final fee depends on the design, materials and the number of adjustment visits. Many private health extras policies pay a rebate towards a custom splint, depending on your cover and limits.
Repair work is where costs climb. As typical market ranges, not Lumi fees, a crown often costs $1,500 to $2,500 per tooth and root canal treatment ranges from about $1,000 for a front tooth to $3,000 for a molar. Catching wear early and protecting the teeth can reduce the chance of needing that level of treatment. A written treatment plan with fees after examination is the only reliable guide for your situation, and you can check our current offers before booking.
While you are waiting for an appointment
If your jaw is sore now, a few low-risk measures may help in the meantime:
- Choose softer foods for a week and skip chewing gum, tough meat and hard bread.
- Have caffeine earlier in the day and keep alcohol away from bedtime.
- Hold a warm face washer over the jaw muscles for a few minutes before bed.
- Through the day, check your jaw position: lips together, teeth apart, jaw loose.
- If you need pain relief, use an over-the-counter product as directed on the pack, and ask a pharmacist if you take other medicines.
- A pharmacy boil-and-bite guard may give some short-term protection, but it is not meant for long-term use.
Book sooner if any of these apply
Most bruxism is not urgent, but some situations should not wait. See a dentist promptly if a tooth hurts sharply when you bite or release, if you can feel a new chip or crack, if a filling or crown has come loose, or if your jaw locks or will not open properly. See your GP as well if you have new or unusually severe headaches, or if someone has noticed you stop breathing in your sleep or daytime sleepiness is affecting driving or work.
Questions about teeth grinding
Will a splint stop me grinding?
Usually not completely. Its main job is protecting the teeth and restorations. Some people notice their jaw muscles feel better with it, but the drivers behind grinding still need attention.
Do I need to wear a splint forever?
Many people with ongoing sleep grinding wear one long term and replace it when it wears or no longer fits. If grinding was linked to a temporary stressor and wear is stable at review, your dentist may talk with you about stopping.
Is grinding connected to snoring or sleep apnoea?
The two often occur together, though it is not yet clear whether one causes the other. If you snore loudly, wake unrefreshed or someone has seen you stop breathing, talk to your GP.
Can stress management really help?
It can, particularly for daytime clenching. Results tend to be partial, so most people combine it with protection for their teeth.
About the author
Dr James Tran is a general dentist at Lumi Dental in Melrose Central, Melrose Park. He holds a Bachelor of Dentistry (BDent) from the University of Sydney and a Graduate Diploma in Oral Implants, and is a Master of the International Congress of Oral Implantologists (MICOI). He works closely with sleep physicians and physiotherapists when bruxism overlaps with broader sleep or musculoskeletal concerns. AHPRA registration DEN0001934469.
Getting your grinding checked
If you think you grind or clench, or someone has heard you at night, an examination at our Melrose Park practice can show how much wear has occurred and which protection suits you. If dental visits make you anxious, our dental anxiety guide may help, and you can book a new-patient assessment through our current deals page.
This article is general information only and is not a substitute for personalised dental advice. Individual diagnosis, treatment options and costs depend on your specific circumstances and should be discussed at a clinical consultation.
