If you wake up with a tired, aching jaw, get headaches at the temples, or have been told your teeth are wearing down, the muscles that close your jaw may be working far harder than they should. For some patients, Botox placed in those muscles, mainly the masseters, is a useful addition to the other treatments for grinding and clenching we offer at Shield Dental Care in Burke, VA.
The muscles behind grinding and clenching
The masseter is the thick muscle at the back of each cheek that you can feel bulge when you clench your teeth. It is one of the strongest muscles in the body for its size. The temporalis, a fan-shaped muscle at the side of the head, works with it to close the jaw. Grinding (bruxism) happens both during sleep and while awake, often without you knowing. It overloads these muscles and puts force on the teeth, fillings and jaw joints that they are not built to take night after night.
How Botox helps
Botox temporarily reduces how strongly a muscle can contract. Injected into the masseters, and sometimes the temporalis, it turns down the force of clenching and grinding without stopping you from chewing, talking or smiling normally. Patients often report less morning jaw soreness, fewer tension-type headaches and a jaw that feels less tight.
It is important to be clear about what Botox does not do. It does not cure bruxism or deal with what drives it, such as stress or sleep problems, and some grinding usually continues. That is why we see it as an add-on to a custom night guard, which protects the teeth, rather than a replacement for one.
What the evidence says
Using botulinum toxin for grinding, clenching or jaw pain is off-label. No product is FDA-approved for these uses, though off-label use is legal and widespread. The research is genuinely mixed. Some studies and reviews report less jaw pain and weaker clenching after treatment. A 2024 analysis that pooled 14 randomized trials found no clear advantage over the comparison treatments, and its authors called for better studies. That is why we treat Botox as an add-on for patients whose symptoms continue with conservative care, not as a first step. We will tell you honestly whether we think you are a good candidate.
Researchers have also asked whether repeated injections into the masseter affect bone density in the jaw. Some earlier, smaller studies reported reduced bone density in the jaw joint area after repeated treatment. A 2025 placebo-controlled trial funded by the manufacturer found no negative effect on jaw bone density after up to two treatments over a year. The question is not fully settled. It is one reason we use the lowest dose that works and leave sensible gaps between treatments.
Who it may suit
- People with sore, tired jaw muscles or tension-type headaches linked to clenching.
- People who still wake up sore even though they already wear a night guard.
- People who clench heavily during the day and have not managed to break the habit.
- People who are wearing through or breaking guards, fillings or crowns.
If your jaw clicks, locks or hurts at the joint itself, the problem may be a TMJ disorder rather than, or as well as, the muscles. Our page on Botox for TMJ and TMD covers that.
What to expect
- Assessment: an exam of your teeth, bite, jaw joints and jaw muscles, and a talk about your symptoms, sleep and daytime habits.
- Treatment: a few injections into each masseter, and into the temporalis if needed. It takes around 10 to 15 minutes.
- Results: the effect builds over one to two weeks and typically lasts around three to four months. Treatment should not be repeated more often than every three months.
Side effects
Expect possible tenderness or a bruise at the injection sites. For a few weeks, chewing tough foods can tire the jaw more quickly. Because the masseter becomes less bulky with rest, some people notice their lower face looking slightly slimmer, and the change reverses as the effect wears off. Some people have the same treatment for exactly that reason; see jaw slimming with Botox. Uncommonly, the product affects a nearby smile muscle and makes the smile look briefly uneven. Like all botulinum toxin products, Botox carries a boxed warning about the rare spread of its effect beyond the injection site. Trouble swallowing, speaking or breathing after treatment is an emergency.
Frequently Asked Questions
Is Botox for teeth grinding FDA-approved?+
No. Using Botox for grinding, clenching or TMJ pain is off-label. That is legal and common, and we will go through it with you before treatment.
Do I still need a night guard?+
Usually, yes. Botox reduces the force of grinding but does not stop it completely, and a custom night guard is what protects the teeth while you sleep. Many patients use both.
Will Botox in my jaw change the shape of my face?+
It can. As the masseter muscle relaxes, some people see their lower face look slightly slimmer. The change reverses as the Botox wears off.
Is it covered by insurance?+
Coverage for Botox used for jaw conditions varies a lot, and many plans do not cover it. We are happy to help you check your plan before treatment.
How long does it last?+
Typically around three to four months. How often it needs repeating depends on how your symptoms respond.