Botox for TMJ and teeth grinding: what the studies show

No botulinum toxin label in the US — Botox, Botox Cosmetic, Dysport, Xeomin, Jeuveau, Daxxify or Letybo — lists TMJ disorders or teeth grinding as an indication, as of our check of the labels in October 2026.

Masseter treatment has the same status: masseter prominence is not on the current Botox Cosmetic label (the DailyMed version published January 8, 2026), even though AbbVie has run phase 2 and phase 3 trials of onabotulinumtoxinA for masseter muscle prominence.

The trials behind these figures measured pain originating in the jaw muscles; the grinding studies also measured biting force.

A 2024 meta-analysis of 15 randomized trials (504 participants) found botulinum toxin reduced muscular TMD pain more than placebo at both 1 and 6 months, with no significant difference in adverse events compared with placebo, and suggested a bilateral dose of 60 to 100 units as possibly optimal.

A 2024 umbrella review of 18 high-quality systematic reviews puts that in context: botulinum toxin reduces myogenous — muscle-origin — TMD pain more than placebo, but not more than standard treatments, and it carries a higher risk of adverse effects on muscle and bone.

That review concluded it should be the last treatment alternative.

For teeth grinding, a 2023 meta-analysis found botulinum toxin injected into the masseters reduced biting force and pain.

Effects appeared within 4 weeks, peaked at 5 to 8 weeks and lasted up to 24 weeks, while oral splints had a more enduring effect after 9 to 12 weeks in the same analysis.

The kind of TMJ problem comes first.

Both 2024 reviews measured pain originating in the jaw muscles — the myogenous type — so those findings speak to that outcome; we could not confirm controlled evidence covering other kinds of TMJ problems.

Dose comes second.

Because no label covers this use, no label sets a TMJ or bruxism dose.

The 2024 meta-analysis suggested 60 to 100 units bilaterally as possibly optimal — a study figure, not a labeled dose for any product.

Units are also product-specific: the Botox Cosmetic label says its units cannot be compared to or converted into units of any other botulinum toxin product, so a study dose describes the product studied, not an interchangeable amount.

Timing has the clearest numbers in the bruxism analysis: effects within 4 weeks, peaking at 5 to 8 weeks and lasting up to 24 weeks.

Those are pooled study findings, not a schedule any one person can count on.

Cost follows the units.

Med spas typically price botulinum toxin per unit or per treatment area, so a session's price is roughly its unit count times the per-unit price.

We could not confirm a national average price for Botox for TMJ, so it is worth asking a provider for a per-unit price and an estimated unit count.

One caution when comparing quotes: because units differ by product, a per-unit price for one brand cannot be compared with a per-unit price for another.

Because this is an off-label use built on mixed evidence, the questions you bring matter more than they would for a labeled treatment.

A licensed provider who has examined you is the one who can say whether it makes sense for your jaw.

These are the questions the evidence says are worth asking.

• Is this off-label for the product you use? No US toxin label lists TMJ disorders or bruxism, so there is no labeled dose, injection map or duration for this use.
• How many units, of which product? The 2024 TMD meta-analysis suggested 60 to 100 units bilaterally, and the Botox Cosmetic label says its units cannot be converted into units of any other brand.
• Why this instead of standard treatments? The 2024 umbrella review concluded botulinum toxin was more effective than placebo but not more effective than standard treatments for muscle-related TMD pain, carried more muscle- and bone-related adverse effects, and should be the last treatment alternative.
• Do the label's warnings apply to me? The Botox Cosmetic label warns that people with neuromuscular disorders such as myasthenia gravis, Lambert-Eaton syndrome or ALS may be at increased risk of clinically significant effects, and the drug is contraindicated with a known hypersensitivity to any botulinum toxin product or an infection at the planned injection site.
• What should I watch for afterwards? The Medication Guide says to avoid driving or dangerous activities if you lose strength, have vision problems or develop drooping eyelids, and to seek immediate medical help for problems swallowing, speaking or breathing.

The CDC advises getting botulinum toxin injections only from a licensed, trained provider using product from an authorized source, and cautions that even FDA-approved product given correctly still carries risk.

It suggests asking whether the provider has a valid healthcare license and is trained to give the injections, and notes that your state may have a look-up tool for checking a provider's or clinic's license.

Who may inject is governed by state rules.

AmSpa, the American Med Spa Association, describes botulinum toxin injection as the practice of medicine, performed by a physician, an independent-practice NP or another licensed professional acting within their scope, with the details varying by state.

Our guide to med spa laws by state collects those rules.

It is also fair to ask a prospective provider how often they give masseter injections and how they handle follow-up.

For the cosmetic side of the same injection — jaw slimming, trial doses and results — see our masseter Botox guide.