Botox for Teeth Grinding: Does It Work? Risks & Evidence

What Is Botox — and Why Is It Used for Teeth Grinding?

Botox is a brand name for onabotulinumtoxinA, one form of botulinum toxin type A.

Botulinum toxin temporarily reduces communication between nerves and targeted muscles. When injected into muscles involved in jaw closing, it can reduce how strongly those muscles contract.

That explains the interest in bruxism.

Bruxism involves repetitive jaw-muscle activity such as grinding, clenching or jaw bracing. If those contractions are particularly forceful, reducing muscle strength could potentially reduce the mechanical load created during the behavior.

But weakening a muscle and stopping the neurological process that produces bruxism are not necessarily the same thing.

Does Botox Actually Stop Teeth Grinding?

Not necessarily.

One of the most informative randomized studies used overnight polysomnography to evaluate people with sleep bruxism before and after botulinum toxin injections.

Researchers found that injections reduced the peak intensity of masseter-muscle contractions for approximately 12 weeks.

What they did not find was a reduction in the generation of sleep-bruxism episodes themselves.

In other words, the jaw-muscle activity continued to occur, but the contractions were less powerful.

What Do Systematic Reviews Say?

Several systematic reviews have concluded that botulinum toxin may improve certain bruxism-related outcomes.

A recent review of randomized trials found reductions in measures such as:

• Jaw-muscle activity
• Bite force
• Muscle pain in some participants
• Some measures of bruxism intensity or events

That sounds encouraging, but there is an important limitation.

Studies differ substantially in how bruxism is diagnosed, which muscles are treated, which toxin products and doses are used, how outcomes are measured and how long patients are followed.

A 2025 overview that evaluated the existing systematic reviews found that their methodological quality was generally low or critically low.

Its conclusion was not that botulinum toxin does nothing. Rather, the existing evidence is not strong or standardized enough to support definitive conclusions about its effectiveness for bruxism.

Can Botox Reduce Bruxism Pain?

Possibly.

Multiple studies have reported improvement in jaw-muscle pain after botulinum toxin treatment, and recent systematic reviews have identified pain reduction as one of the more promising findings.

But pain associated with grinding or clenching is not always caused by the same process.

Bruxism, painful temporomandibular disorders and facial pain can coexist without being interchangeable diagnoses.

Someone with painful masseter muscles may therefore respond differently from someone whose primary problem is tooth wear but who has no muscle pain.

That is one reason an accurate diagnosis matters before injections are considered.

Does Botox Treat the Cause of Bruxism?

Usually, that is not the best way to think about it.

Bruxism is not simply caused by jaw muscles being “too strong.”

Sleep bruxism in particular is a complex sleep-related jaw-muscle behavior involving the nervous system. Awake bruxism can involve habits such as clenching or bracing during concentration, tension or other activities.

Botulinum toxin acts on the muscle receiving the injection.

It can reduce the muscle's ability to contract forcefully, but that does not necessarily remove the factors generating the behavior.

For the broader picture, see What Causes Teeth Grinding? Bruxism Causes & Risk Factors.

Is Botox FDA-Approved for Bruxism?

No.

In the United States, botulinum toxin products have FDA-approved uses for a number of medical and cosmetic conditions, but bruxism is not an approved indication for Botox.

Using it for teeth grinding or clenching is therefore considered off-label.

Off-label use does not automatically mean a treatment is inappropriate or unsafe. Physicians and other appropriately licensed clinicians routinely use medications off-label when they believe the evidence and individual circumstances support doing so.

It does mean that there is no FDA-approved standardized Botox protocol specifically for bruxism.

How Long Does the Effect Last?

Botulinum toxin is temporary.

Clinical studies of bruxism commonly evaluate effects over several weeks or months. As nerve signaling to the muscle gradually recovers, muscle strength can return.

Someone who benefits from treatment may therefore consider repeat injections with their clinician.

This is also where an important evidence gap appears: we have considerably less high-quality information about repeated treatment over many years than we do about short-term outcomes after one or a small number of injections.

What Are the Potential Downsides?

Any treatment that intentionally weakens chewing muscles deserves careful consideration.

Reported adverse effects in bruxism studies have generally been mild and temporary, but can include:

• Pain or discomfort at the injection site
• Temporary changes in chewing strength
• Changes in facial appearance as the treated muscle becomes smaller
• Smile asymmetry or other cosmetic changes

Botulinum toxin products also carry broader safety warnings, including the rare possibility that toxin effects can spread beyond the injection area and cause problems such as muscle weakness, swallowing difficulty or breathing difficulty.

The appropriateness of treatment therefore depends on a person's medical history, diagnosis, medications, neuromuscular health and other individual factors.

What About Masseter Muscle Atrophy?

A reduction in muscle size is not surprising after repeated weakening of the masseter.

In fact, reducing masseter prominence is an intentional cosmetic use of botulinum toxin in some countries and clinical settings.

For someone receiving treatment purely because of grinding, however, a change in lower-face shape may be an unintended effect.

The amount of change can depend on factors including dose, treatment frequency, anatomy and the muscles being treated.

If facial appearance is important to you, it belongs in the treatment discussion before injections begin.

Our article Can Bruxism Change the Shape of Your Face? explains the separate relationship between jaw-muscle size, clenching and facial appearance.

Does Masseter Botox Cause Jawbone Loss?

This is one of the most debated questions — and the evidence does not support a simple yes or no.

Animal research raised concerns that reducing mechanical loading from the chewing muscles could affect the mandible.

Some small human studies have also reported changes in certain measurements of mandibular bone after injections.

But the clinical evidence has been inconsistent.

A 2024 systematic review examining botulinum toxin injections into the chewing muscles found no significant bone changes in most of the included studies.

The reviewers concluded that there was no clear pattern establishing whether botulinum toxin causes mandibular bone resorption, and that the magnitude and clinical significance of reported changes remained uncertain.

What Does Newer Bone-Density Research Show?

Newer data make the picture even more nuanced.

A 2025 randomized, placebo-controlled study examined CT scans from 123 healthy adults receiving one or two bilateral masseter treatments with onabotulinumtoxinA over 12 months.

Researchers found no clinically significant negative changes in bone density in the mandibular condyle, ramus or premolar region compared with baseline or placebo.

There are important limits to applying that finding to bruxism.

Participants were being studied for masseter muscle prominence rather than bruxism, and the trial evaluated a standardized treatment paradigm for only one year.

It therefore cannot tell us what might happen after repeated injections for many years or under every dosing approach used in clinical practice.

Does Botox Make It Difficult to Chew?

Botulinum toxin deliberately reduces the strength of treated muscles, so changes in chewing function are biologically plausible.

Many clinical studies report acceptable short-term tolerance, and severe chewing problems have not been a universal finding.

But individual responses, injection patterns and doses differ.

A treatment intended to reduce excessive jaw-muscle force should preserve enough function for comfortable everyday chewing, which is another reason clinician experience matters.

Can Botox Prevent Tooth Damage From Grinding?

Potentially reducing grinding force could theoretically reduce some mechanical loading on the teeth.

However, Botox should not be treated as guaranteed dental protection.

Since sleep-bruxism activity may continue even when contraction intensity falls, the teeth may still make contact.

Someone with substantial existing wear, cracks or vulnerable dental restorations may still need direct protection of the teeth.

Botox vs. a Night Guard: They Do Different Jobs

Botox and a night guard should not be presented as interchangeable treatments.

Botulinum toxin acts on muscle strength.

A night guard creates a physical surface between the teeth.

A properly fitted night guard does not cure the neurological or behavioral process of bruxism either. Its primary purpose is protecting tooth structure and restorations from direct tooth-to-tooth grinding.

That mechanical role is supported by the National Institute of Dental and Craniofacial Research, which includes mouth guards among approaches used to prevent tooth damage from bruxism.

Read Does a Dental Night Guard Stop Teeth Grinding? for the distinction between stopping the behavior and protecting the teeth.

Is Botox Better Than a Night Guard?

There is not enough evidence to make that blanket statement.

The right comparison depends on the goal.

If the primary concern is protecting enamel, crowns or restorations, a dental appliance directly addresses tooth-to-tooth contact.

If someone has severe jaw-muscle pain or unusually forceful contractions that have not responded adequately to more conservative management, a qualified clinician may consider botulinum toxin as part of a broader treatment plan.

Some patients may ultimately use both approaches for different reasons.

What Should Be Tried Before Botox?

There is no single treatment ladder that applies to every person with bruxism.

Management starts by identifying what problem actually needs treatment.

Depending on the situation, that might include:

• Monitoring mild bruxism that is not causing damage
• Using reminders and behavioral strategies for awake clenching
• Protecting vulnerable teeth with an appropriately fitted appliance
• Evaluating medications that may coincide with new symptoms
• Addressing smoking, alcohol or heavy caffeine use when relevant
• Evaluating persistent jaw or facial pain separately
• Investigating symptoms of a possible sleep-related breathing disorder

Irreversible dental correction, orthodontics or surgery should not be recommended simply on the assumption that an imperfect bite caused someone's bruxism.

Who Should You Talk to About Botox for Bruxism?

Start with a clinician who can distinguish bruxism from other causes of jaw pain and understands both jaw function and botulinum toxin treatment.

Useful questions include:

• Do I have sleep bruxism, awake bruxism, painful TMD or a combination?
• What symptom are we specifically trying to improve?
• What evidence supports Botox for my particular problem?
• What alternatives are reasonable first?
• What side effects should I expect?
• How might treatment affect chewing strength or facial appearance?
• What is the plan if injections need to be repeated?

That is a more useful conversation than simply asking whether Botox is “good” or “bad” for teeth grinding.

Frequently Asked Questions

Does Botox work for teeth grinding?

It may reduce jaw-muscle strength, contraction intensity and pain in some people. Research does not establish that it eliminates the underlying bruxism behavior in everyone.

Can Botox stop sleep bruxism?

A placebo-controlled sleep study found that Botox reduced the intensity of masseter contractions but did not reduce the generation of sleep-bruxism episodes. This suggests it may change the force of the behavior more reliably than whether the behavior occurs.

Is Botox approved for teeth grinding?

No. In the United States, Botox treatment for bruxism is an off-label use.

How long does Botox for teeth grinding last?

The effect is temporary and generally lasts for a period of months rather than permanently. Duration varies among individuals and treatment protocols.

Can masseter Botox change your face shape?

Yes. Weakening the masseter can reduce its size over time, which may make the lower face or jawline appear narrower in some people.

Does Botox cause permanent jawbone loss?

Current evidence does not establish that. A 2024 systematic review found no clear pattern linking injections into the chewing muscles with mandibular bone resorption. Longer-term repeated treatment still deserves further study.

Can Botox cause loose teeth?

There is not good evidence showing that properly administered masseter Botox routinely causes loose teeth. Claims that Botox has been proven to permanently destroy jawbone and cause tooth loss overstate the available human evidence.

Is a night guard safer than Botox?

They are different interventions with different purposes and risks. A night guard primarily protects the teeth mechanically, while botulinum toxin temporarily reduces muscle activity. Which approach is appropriate depends on the problem being treated.

Can I use a night guard after getting Botox?

A dental professional may still recommend a protective appliance when tooth wear or damage is a concern because Botox does not necessarily eliminate bruxism activity.

The Bottom Line

Botox for teeth grinding is neither the miracle cure it is sometimes marketed as nor the proven jawbone-destroying treatment it is sometimes portrayed to be.

Research suggests botulinum toxin can reduce bite force, muscle-contraction intensity and possibly jaw-muscle pain in selected people with bruxism.

At the same time, one of the best-controlled sleep studies found that it reduced the intensity of sleep-bruxism contractions without stopping the underlying episodes.

Evidence remains limited by small studies, different diagnostic methods, inconsistent treatment protocols and relatively short follow-up.

Concerns about long-term muscle and mandibular changes deserve continued research, especially with repeated treatment, but current human evidence does not justify claiming that Botox inevitably or permanently damages the jawbone.

For someone considering injections, the useful question is not simply “Does Botox work?” It is: what exactly are we trying to treat, and does the expected benefit justify the limitations and risks for this particular patient?