Sleep and awake bruxism: why a night guard does not treat it

Registro da atividade muscular: episódios curtos do bruxismo do sono à esquerda, atividade sustentada do bruxismo de vigília à direita
Sleep and awake bruxism: why a night guard does not treat it

Resumo

There are two bruxisms. Sleep bruxism is the one that grinds at night. Awake bruxism, holding the teeth together or bracing the jaw during the day, is the more common of the two, 23% of the population against 21%, and it runs for hours without a sound. A night guard protects the tooth but does not treat either one. What needs investigating is the bite, the day and the sleep.

You wake with a locked jaw. Or you catch yourself mid-afternoon with your teeth touching and your jaw tense. You bought a night guard, you wear it every night, and the feeling is still there.

Two things need saying. A night guard protects your tooth. It does not treat your bruxism. And there are two bruxisms, not one.

There are two, and the more common one is not the night one

Sleep bruxism is masticatory muscle activity while you sleep. It is the grinding, the sound your partner hears.

Awake bruxism happens while you are awake. It is not grinding: it is holding your teeth together, clenching lightly and sustaining it, or bracing your jaw while you work, drive or look at your phone. Almost nobody notices.

The international consensus defines awake bruxism as repetitive or sustained tooth contact, or bracing and thrusting of the mandible, during wakefulness. Neither one is classified as a disease: both are muscle behaviours.
Verhoeff, Lobbezoo et al., 2025

And here is the figure that changes the conversation:

Awake bruxism is more common than sleep bruxism: 23% of the population against 21%. Among adult women the gap is wider still, 18.4% against 14.5%.
Zielinski, Pajak and Wojcicki, 2024

It makes sense when you look at the clock. Sleep bruxism happens in short episodes through the night. Awake bruxism can run for hours, every day, without a single sound. That is why so many people wear a guard for years and still have pain. The guard is not in the right place at the right time.

Why the guard does not solve it on its own

A guard is a physical barrier. It sits between the arches and takes the force that would otherwise reach the tooth. That is protection, and good protection, at night.

The Cochrane review of occlusal splints concluded that there is not sufficient evidence to support or to refute that a splint treats sleep bruxism. The likely benefit is protecting the tooth from wear.
Macedo et al., 2007

So the guard looks after the structure. The cause is still unanswered. And the question that changes the treatment is a different one: why are you clenching?

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What we investigate

The bite and the joint. How your teeth meet when you close, where one contact arrives before the others, the state of the facial muscles. This is dentistry’s direct ground.

Your day. With awake bruxism this is half the work. Which moments you catch yourself clenching in: at the computer, in traffic, in a difficult conversation. That mapping is simple and nobody does it.

Your sleep. Anyone who grinds at night deserves to have their sleep assessed by a physician. Bruxism and apnoea appear together often, though the literature still cannot confirm a relationship between the two in adults. Diagnosing apnoea is the physician’s job. Dentistry handles the jaw, the wear, the bite and, where indicated, the appliance.

What to watch for

Tick what you recognise and bring it to the appointment.

  • You wake with a locked or aching jawMostly in the first minutes of the day
  • During the day you catch yourself with your teeth touchingAt rest, upper and lower teeth should not meet
  • Someone has heard you grinding at nightUsually whoever sleeps beside you
  • Headache that starts at the templesOn waking, or building through the day
  • Teeth that look shorter, chipped or sensitiveMostly the front ones and the tips of the canines
  • Restorations that come loose or crack oftenRepeated load charges the restoration before the tooth
  • Tooth marks on your tongue or cheekYou can see them in the mirror
  • You snore, or wake without feeling restedReason to have your sleep assessed by a physician

Important

This list settles nothing. Bruxism is assessed with a clinical examination and, where indicated, a sleep study. Recognising several items is a reason to seek an assessment, not to conclude.

When to seek an assessment

It is worth seeking one if there is visible wear on the teeth, pain in the jaw, face or ear, if you already wear a guard and the symptoms continue, or if there is snoring and sleep that does not rest you.

The aim is not to abolish bruxism by decree. It is to understand what sustains the behaviour and protect the structure while the cause is worked on.

Your guard still has a place

Nothing here says stop wearing it. It protects, and protection matters. What this piece says is that the guard should not be the end of the conversation. It should be the start.

If you already wear a guard and the symptoms continue, the guard is doing its job. What is missing is investigating what sits behind it.

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Frequently asked questions

What is the difference between sleep bruxism and awake bruxism?

Sleep bruxism happens while you sleep, in short episodes through the night, and usually makes a sound. Awake bruxism happens while you are awake: holding the teeth together, clenching lightly and sustaining it, or bracing the jaw during the day. It makes no sound and can run for hours.

Which of the two is more common?

Awake bruxism. A meta-analysis published in 2024 found 23% of the population with awake bruxism against 21% with sleep bruxism. Among adult women the gap is wider: 18.4% against 14.5%.

Does a night guard treat bruxism?

No. It protects the tooth from force, and that matters. The Cochrane review of occlusal splints concluded there is not sufficient evidence to state that a splint treats sleep bruxism. And it is not in the mouth during the day, which is when awake bruxism happens.

Is bruxism a disease?

By the 2025 international consensus, no: in both types it is a behaviour of the masticatory muscles. What makes it a clinical matter are the consequences: wear, cracks, fractured restorations and jaw pain.

Is bruxism linked to sleep apnoea?

The two conditions appear together often, but a review published in the journal Sleep in 2022 concluded it is not possible to confirm a relationship between sleep bruxism and obstructive sleep apnoea in adults. In practice it is a reason to have sleep assessed by a physician, not to claim one causes the other.

An hour and a half, with the dentist herself

  • Full functional assessment of the bite and the joint
  • Digital scanner and imaging when indicated
  • A plan explained before anything is started

Alameda Lorena, 1.304 · Jardim Paulista, São Paulo

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References

  1. Verhoeff M. C., Lobbezoo F., Ahlberg J. et al. Updating the Bruxism Definitions: Report of an International Consensus Meeting. Journal of Oral Rehabilitation, 2025;52(9):1335-1342. pmc.ncbi.nlm.nih.gov
  2. Lobbezoo F., Ahlberg J., Raphael K. G. et al. International consensus on the assessment of bruxism: Report of a work in progress. Journal of Oral Rehabilitation, 2018;45(11):837-844. onlinelibrary.wiley.com
  3. Zielinski G., Pajak A., Wojcicki M. Global Prevalence of Sleep Bruxism and Awake Bruxism in Pediatric and Adult Populations: A Systematic Review and Meta-Analysis. Journal of Clinical Medicine, 2024;13(14):4259. pmc.ncbi.nlm.nih.gov
  4. Macedo C. R., Silva A. B., Machado M. A., Saconato H., Prado G. F. Occlusal splints for treating sleep bruxism (tooth grinding). Cochrane Database of Systematic Reviews, 2007, CD005514. cochrane.org
  5. Hardy R. S., Bonsor S. J. The efficacy of occlusal splints in the treatment of bruxism: A systematic review. Journal of Dentistry, 2021;108:103621. sciencedirect.com
  6. Pauletto P. et al. Sleep bruxism and obstructive sleep apnea: association, causality or spurious finding? A scoping review. Sleep, 2022;45(7):zsac073. academic.oup.com
  7. Polmann H., Reus J. C. et al. Association between sleep bruxism and stress symptoms in adults: A systematic review and meta-analysis. Journal of Oral Rehabilitation, 2021. onlinelibrary.wiley.com

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Tags :
night guard,occlusal splint,sleep apnoea,sleep bruxism,TMJ

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Dra. Debora Ayala

Com mais de 35 anos de experiência, é a única brasileira premiada com 1º lugar na Academia Européia de Estética por técnica desenvolvida por ela.

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