Botox for TMJ: Does It Work and Who Is It For?

TMJ disorders: joint vs muscle problems

NIDCR explains that temporomandibular disorders are a group of more than 30 conditions that cause pain and dysfunction in the jaw joint and in the muscles that move the jaw. "TMJ" is the joint itself; "TMD" is the disorder. NIDCR groups them into three broad categories: disorders of the joint (including disc problems), disorders of the chewing muscles, and headaches associated with TMD. A person may have more than one at the same time.

Guy's and St Thomas' NHS Foundation Trust notes that the most common type of TMD is related to the muscles and causes myofascial pain, and that in most cases TMD gets better on its own. This distinction matters for botulinum toxin, because a treatment that relaxes muscles is aimed at muscle pain, not at a displaced disc or a worn joint. Clicking without pain is common, considered normal and needs no treatment, according to NIDCR.

How botulinum toxin acts on muscles

Botulinum toxin type A is a protein made by the bacterium Clostridium botulinum. Guy's and St Thomas' explains that it is sometimes known by brand names such as Botox® and Xeomin®; the brand is the product, while botulinum toxin type A is the active substance. It is used to relax muscles in many medical problems.

The injections relax the muscles by temporarily blocking the nerve signal to the muscle, so the overworked jaw muscle is less active. In the areas treated, the muscles stay weaker until the effect wears off. The leaflet stresses one key limitation: the injections do not stop the habits that may be causing TMD, such as clenching, although they might reduce the damage those habits cause.

What the evidence says

NIDCR states that botulinum toxin type A is approved by the US Food and Drug Administration for some conditions, such as migraine, but not for TMD. Studies have evaluated it for TMD with mixed results, and it remains unclear whether it is effective for relieving TMD symptoms. US approval status also does not tell you how a treatment is regulated in other countries.

A 2024 umbrella review in the journal Drugs, which pooled 18 high-quality systematic reviews on muscle-related TMD, found that botulinum toxin reduced pain more than a placebo, but not more than standard treatments, and that it did not improve jaw movement. The authors note that the evidence is inconsistent, that the trials used different protocols and had methodological drawbacks, and that there are concerns about adverse effects on muscle and bone. They recommend it as the last treatment alternative.

Who may be considered: clenching and bruxism

Guy's and St Thomas' describes using the injections to help manage some symptoms of TMD, mainly jaw-muscle pain in myofascial TMD, after assessment in a specialist clinic. The 2024 review recommends limiting it to specific cases of persistent muscle-related TMD where standard treatments have not relieved the pain enough.

Clenching and grinding (bruxism) can overload the jaw muscles, and NIDCR lists reducing habits such as jaw clenching among the first steps. In adults whose jaw-muscle pain is linked to clenching or grinding and has not improved with simpler measures, our botulinum toxin for bruxism service in Bilbao offers assessment by a clinical neurophysiologist, who places the injections guided by electromyography (EMG) when they are indicated (consultations are in Spanish). It is not a treatment for every TMD.

Who should not have it, and who is unlikely to benefit

Guy's and St Thomas' lists situations in which you should not have botulinum toxin injections:

An allergy to botulinum toxin.
An infection around the injection site.
Feeling unwell or having a fever.
Pregnancy or breastfeeding.
A pre-existing neuromuscular disease, such as myasthenia gravis.

If you take blood-thinning medicines, the team will discuss whether the injections are suitable. Because the toxin acts on muscles, it is unlikely to help pain that comes from the joint itself, such as disc problems, and NIDCR reminds that facial pain may not be TMD at all, so other conditions need ruling out first. You can read more about the different presentations in our guide to TMJ symptoms.

What the procedure involves

At Guy's and St Thomas', the injections are given in an outpatient clinic in an appointment of about 45 minutes. You must say if you have had any botulinum toxin injections in the previous 3 months, avoid alcohol for 24 hours beforehand because it can increase bruising, and have a light meal before the appointment.

The skin is cleaned with antiseptic, the practitioner asks you to use certain face muscles to see how they work and marks the areas to inject, and a needle delivers the toxin into the affected muscle. Some discomfort is normal. Afterwards, the area should be kept clean and not massaged or rubbed for 48 hours. The number of injections needed differs for each person, and the dose is decided by the treating professional, never by the patient.

Side effects and safety

Guy's and St Thomas' says the injections are generally well tolerated but, like all medicines, can cause side effects. Common ones include:

Soreness and bruising at the injection site.
Flu-like symptoms, including headache, in the first 24 hours.
Temporary weakness or drooping of the face, for example of the lower lip, eyelids or eyebrows.
A change in face shape or excessive muscle weakness.
Skin rash or itching.
Resistance to the toxin after repeated treatments, so it stops working, or no effect at all.

Rarely, serious problems can develop hours, days or weeks after treatment. The 2024 review adds that it cannot be considered a risk-free treatment, citing reports of muscle thinning, reduced bite force and changes in jaw bone after injections. Ask about these risks before deciding.

How long it lasts, and what to try first

According to Guy's and St Thomas', there is no immediate change: the toxin can take up to 10 days to start working and up to 3 weeks for the full effect, which lasts about 6 months on average. Further treatment may be considered when the effect wears off; in that service, patients are offered two treatments before returning to their dentist or GP. You should keep using any splint and self-management strategies.

NIDCR recommends starting with conservative treatments and avoiding those that permanently change the jaw, teeth or bite. First steps include eating soft foods, using heat or cold together with gentle jaw stretching and strengthening exercises, simple pain relief and reducing habits such as clenching, gum chewing or nail biting. Physical therapy, relaxation, cognitive behavioral therapy and biofeedback can also help.

Where the sources differ

Guy's and St Thomas' states that the treatment usually reduces jaw-muscle pain for most people with myofascial TMD, while also warning that there is no guarantee of the desired effect. NIDCR is more cautious: results have been mixed and it is unclear whether the treatment works.

The 2024 umbrella review sits in between: it finds a pain benefit over placebo, supported by moderate evidence, but no advantage over standard treatments and a risk of adverse effects, so it places botulinum toxin last in line. Together, the sources suggest that it may help selected people with persistent muscle pain, but it is not a proven or first-line option for TMD in general.

In summary

Botulinum toxin relaxes the jaw muscles for a few months and may ease pain in some people with muscle-related TMD, particularly when clenching or grinding plays a part. It does not treat joint problems, does not stop the underlying habit and is not approved in the US for TMD. Evidence is mixed and of limited quality, and side effects are possible.

Before considering it, try conservative measures and ask the professional: which type of TMD do I have, how could this help my specific problem, what are the risks, and what simpler treatments should I try first? NIDCR suggests asking for this explanation in detail and in a way you can understand.

Frequently asked questions about Botox for TMJ

These answers are general information and do not replace an examination or individual medical advice.

Does Botox for TMJ really work?

For some people with muscle-related TMD it reduces pain more than a placebo, but results are mixed, it does not beat standard treatments and it is not FDA-approved for TMD.

What kind of jaw pain might it help?

Pain from overworked jaw muscles (myofascial TMD), for example linked to clenching or grinding, that has not improved with simpler treatments. It is unlikely to help joint or disc problems.

How is the injection done?

In a clinic, a needle delivers the toxin into the marked jaw muscles. It takes about 45 minutes, without local anesthetic, and some discomfort is normal.

How long do the effects last?

It can take up to 10 days to start working and up to 3 weeks for the full effect, which lasts about 6 months on average.

What are the side effects?

Soreness and bruising, flu-like symptoms, temporary facial weakness, rash or loss of effect over time. Trouble swallowing, speaking or breathing needs emergency care.

Why is it not a first-line treatment for TMJ?

Most TMD improves on its own or with simple care, the evidence is limited and the toxin carries risks, so experts recommend conservative treatments first.

Sources

This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.