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Health condition · Clinically reviewed

Bruxism, grinding, clenching and how to protect your teeth and jaw.

Sleep bruxism and awake clenching are common, treatable and often a signal of something else - stress, medication effects or obstructive sleep apnoea worth ruling out.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE, British Society of Dental Sleep Medicine and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice, including splint therapy, sleep apnoea screening and masseter botulinum toxin.

Key facts

Bruxism at a glance.

The essentials, in plain English - what it is, why it happens and how it is treated in the UK today.

  • What it is

    Repetitive jaw-muscle activity - grinding, clenching or bracing of the teeth, either during sleep or when awake.

  • Two patterns

    Sleep bruxism is driven by rhythmic masticatory muscle activity in arousals; awake bruxism is largely stress-related clenching.

  • How common

    Around 8 to 30 per cent of adults report bruxism at some point, and about 15 per cent of children - mostly the sleep form.

  • Why it matters

    Tooth wear, fractures, hypersensitivity, TMJ pain, tension headaches, earache and disturbed sleep for both partners.

  • A key driver

    Obstructive sleep apnoea is strongly linked to sleep bruxism - screening for it is a routine part of assessment.

  • Treatment ladder

    Treat the underlying cause, protect teeth with a custom splint, add behavioural therapy and consider Botox for refractory cases.

Why this guide matters

Treat the driver, not just the teeth.

Splints protect enamel, but the best long-term results come from treating the underlying reason your jaw muscles are so active at night.

  • Screen for sleep apnoea

    Obstructive sleep apnoea is one of the strongest drivers of sleep bruxism - treating it often calms the grinding.

  • Protect the teeth early

    A custom hard splint prevents wear, fractures and hypersensitivity while you work on the underlying cause.

  • Take the mind seriously

    Stress, anxiety and low mood drive awake clenching - CBT, biofeedback and relaxation are proper medical treatments.

How the diagnosis is made

From worn teeth to a clear plan.

The steps a UK dentist and sleep team will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    Dental examination

    A structured look at tooth wear, fractures, attritional facets, gum recession, occlusion and the TMJ.

  2. 02

    Assessing

    Sleep and partner history

    Snoring, witnessed apnoeas, grinding sounds, morning jaw stiffness and daytime sleepiness (Epworth, STOP-BANG).

  3. 03

    Assessing

    Stress and mood screen

    PHQ-9 and GAD-7 to pick up the psychological drivers of awake clenching and disturbed sleep.

  4. 04

    Confirming

    Medication and lifestyle review

    SSRIs, ADHD stimulants, antipsychotics, recreational drugs, caffeine and alcohol can all drive muscle activity.

  5. 05

    Confirming

    Sleep study if indicated

    Polysomnography confirms sleep bruxism (scoring RMMA) and identifies obstructive sleep apnoea, the most important comorbidity.

  6. 06

    Planning

    Dental imaging

    Panoramic or CBCT imaging assesses tooth and bone damage; TMJ MRI is reserved for suspected joint pathology.

  7. 07

    Planning

    Multidisciplinary plan

    A joint plan across dentistry, sleep medicine, psychology and, where needed, neurology or oral medicine.

Typical timeline: from a first dental review to a settled plan in weeks, not months.

Symptoms

What bruxism actually looks and feels like.

The mix of tooth wear, jaw and head pain, plus the visible clues a dentist looks for. And the signs that mean it is time to escalate.

  • Tooth wear and facets

    Flat, shortened cusps and shiny wear facets on matching upper and lower surfaces.

  • Cracks and hypersensitivity

    Cracked cusps, hairline fractures and cold or sweet sensitivity from enamel loss and dentine exposure.

  • Jaw pain and stiffness

    Aching masseter or temporalis muscles, worse on waking, with limited or clicking jaw opening.

  • Tension headaches and earache

    Temporal, frontal or occipital pressure headaches, referred earache and occasional tinnitus.

  • Masseter hypertrophy

    A squared, bulky lower face from chronically overworked jaw muscles - a visible clue to long-standing bruxism.

  • Tongue and cheek signs

    Scalloped tongue edges and a white ridge (linea alba) along the inside of the cheek where teeth press.

  • Partner-reported grinding

    A partner hearing loud grinding at night is one of the most reliable clinical clues.

  • Red flag - cracked teeth or implant fail

    Repeated crown fractures, cracked teeth or failing implants deserve a specialist prosthodontic review.

Treatment

How bruxism is treated in the UK.

Splint first, treat the drivers, add behavioural therapy - and consider masseter Botox for severe or refractory sleep bruxism.

  • Custom occlusal splint

    A dentist-fitted night guard - hard acrylic, full-arch - protects teeth and reduces muscle activity. Better than any over-the-counter guard.

  • Treat sleep apnoea

    CPAP, a mandibular advancement device or weight and surgical options can dramatically reduce sleep bruxism when OSA is present.

  • CBT and biofeedback

    Cognitive-behavioural therapy, relaxation training and daytime awareness cues reduce awake clenching and improve sleep.

  • Sleep hygiene

    Regular sleep-wake times, screen wind-down, a cooler dark bedroom and less late caffeine or alcohol calm the arousal system.

  • Masseter botulinum toxin

    Botox into masseter and temporalis muscles has good evidence for refractory or severe sleep bruxism. Effect lasts three to six months.

  • Physiotherapy

    Jaw, neck and postural physiotherapy with trigger-point release, heat and gentle stretching helps TMJ and myofascial pain.

  • Medication review

    Where possible, adjust SSRIs, stimulants and antipsychotics that trigger bruxism, and address recreational drug, caffeine and alcohol use.

  • Restorative dentistry

    Bonding, veneers, crowns or full-mouth rehabilitation restore worn or fractured teeth once the underlying grinding is controlled.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your dentist, GP or sleep specialist knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • International Consensus on Bruxism (Lobbezoo et al.). Definition, assessment and grading.

  • British Society of Dental Sleep Medicine. Guidance on sleep bruxism and mandibular devices.

  • NICE. Obstructive sleep apnoea/hypopnoea syndrome (NG202) - relevant to sleep bruxism.

  • Royal College of Surgeons (Faculty of Dental Surgery). Occlusal splint therapy standards.

Red flags

When bruxism needs urgent attention.

Most bruxism is manageable in primary care and dentistry. These are the situations that need a specialist opinion.

  • Suspected obstructive sleep apnoea

    Loud snoring, witnessed apnoeas, daytime sleepiness or a high STOP-BANG score need urgent sleep-medicine referral before splint therapy alone.

  • Cracked or fractured teeth

    A cracked cusp, split tooth or repeated crown fracture warrants prompt dental review to prevent tooth loss.

  • Failing dental implants

    Recurrent implant loosening or peri-implant bone loss in a grinder needs specialist prosthodontic and occlusal input.

  • Locked or dislocating jaw

    Sudden inability to close or open the mouth, or a jaw that dislocates, needs same-day maxillofacial assessment.

  • New neurological signs

    New dystonia, tremor, facial spasms or cognitive change alongside bruxism should trigger a neurology referral.

  • Severe unexplained facial pain

    Progressive, unilateral or night-waking facial pain not explained by muscle tenderness needs a specialist pain and imaging review.

  • Bruxism in children with red flags

    Grinding with breathing pauses, restless sleep or behavioural change in children needs a paediatric sleep and ENT opinion.

  • Recreational drug use

    Ongoing MDMA, cocaine or methamphetamine use is a major driver - safe cessation support should be part of the plan.

  • Suicidal ideation or severe distress

    Bruxism sits alongside anxiety and low mood - if either becomes severe, urgent GP or crisis mental-health support is needed.

Living with it

A manageable condition, with a clear ladder.

Four things that make the biggest difference day to day - wearing the splint, calming the nervous system, catching daytime clenching and ruling out sleep apnoea.

A quiet reminder

Small nightly habits protect your smile.

Consistency with the splint, wind-down and stress work does more than a heroic week that does not last.

  1. 01 Protect

    Wear the splint every night

    A custom splint only works when it is in the mouth. Keep it in a case, clean it daily and replace when worn.

  2. 02 Calm

    Wind the day down

    Stress management, a proper wind-down hour and less late caffeine or alcohol are as important as any device.

  3. 03 Awareness

    Notice awake clenching

    Phone reminders, sticky-note cues or a simple biofeedback app help you catch and release daytime jaw tension.

  4. 04 Escalate

    Get sleep apnoea ruled out

    If snoring, tiredness or a bed partner’s concern is part of the picture, ask about a sleep study before things get worse.

Frequently asked

Everything we get asked about bruxism.

Quick answers on splints, sleep apnoea, stress, medications and masseter Botox.

  • What is bruxism?

    Bruxism is repetitive activity of the jaw muscles - grinding, clenching or bracing the teeth. It comes in two main forms: sleep bruxism, driven by rhythmic masticatory muscle activity during arousals in sleep, and awake bruxism, which is usually stress-related clenching during the day.

  • Is teeth grinding actually harmful?

    It can be. Long-term bruxism causes tooth wear, fractures, hypersensitivity, gum recession, TMJ pain, tension headaches, earache and disturbed sleep for both you and your partner. Severe cases lead to cracked teeth, tooth loss and failed crowns or implants.

  • What causes bruxism?

    It is multifactorial. Common drivers include stress, anxiety and depression; sleep disorders (especially obstructive sleep apnoea, but also insomnia, reflux and REM sleep behaviour disorder); medications such as SSRIs, ADHD stimulants and antipsychotics; recreational drugs like MDMA, cocaine and methamphetamine; neurological conditions such as Parkinson’s or dystonia; genetic tendency; and lifestyle factors like caffeine, alcohol and smoking.

  • Do I need a sleep study?

    Not everyone, but you should be screened for sleep apnoea. If you snore, feel tired during the day, wake unrefreshed, or a partner reports pauses in breathing, a polysomnography sleep study can confirm both obstructive sleep apnoea and sleep bruxism. Treating the apnoea often improves the grinding.

  • Are shop-bought mouthguards good enough?

    For occasional or mild bruxism they can help short-term. For anything more, a custom-made hard acrylic splint from your dentist fits better, protects the teeth more reliably and is less likely to cause its own bite problems. A prosthodontist or specialist dentist should design it.

  • What about Botox for grinding?

    Botulinum toxin injected into the masseter and temporalis muscles has good evidence for refractory or severe sleep bruxism. It reduces muscle activity for around three to six months, eases pain and slims a bulky jawline. It should be given by a clinician trained in masticatory-muscle injection.

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