Botox for a Slimmer Jaw? What the FDA's New Masseter Review Could Mean

If you've spent any time on skincare TikTok, you've probably seen the term "jaw Botox" or "masseter Botox" — injections used to soften a wide, square lower face. It's been a popular off-label use for years. Now it's on its way to becoming official: Allergan Aesthetics has asked the FDA to approve Botox Cosmetic specifically for masseter muscle prominence, which would make it the fifth approved aesthetic use for the drug.

What is masseter muscle prominence?

The masseter is the main muscle you use to chew. In some people — often those who clench or grind their teeth — it becomes enlarged, which widens and squares off the lower face. Reducing its activity with neurotoxin injections can soften that shape, without surgery.

What Allergan just submitted to the FDA

The company filed a supplemental Biologics License Application seeking approval for "marked to very marked masseter muscle prominence associated with masseter muscle activity in adults." If cleared, it would be the first FDA-approved neurotoxin for this specific use, and would give Botox Cosmetic more approved aesthetic indications than any competing brand. Here's what the underlying data showed:

• Two Phase 3 trials both met their primary endpoint, showing statistically significant improvement in masseter prominence compared to placebo

• Patients reported roughly double the satisfaction of the placebo group

• No FDA decision date has been announced yet — sBLA reviews typically take several months to a year

"Jaw Botox" isn't new — it's just getting formally regulated

Injectors have offered masseter treatments off-label for well over a decade, often for jaw slimming, teeth-grinding relief, or both. FDA approval wouldn't create a new treatment out of nothing — it would attach an official safety and efficacy label to something already common practice, which tends to bring clearer dosing standards and more consistent training across providers.

Why this is worth knowing, whatever treatment you're considering

Neurotoxins keep expanding past wrinkle treatment into contouring and even functional uses like teeth-grinding relief, and that pattern says something useful about the aesthetics industry generally: approvals are chasing what patients are already asking for. Whatever you're researching — injectables, resurfacing, or anything in between — it's worth asking any provider what's actually FDA-approved for that specific use versus what's being offered off-label, and what evidence backs it up.

We keep our own menu narrow on purpose — CO2 laser resurfacing and IPL, and nothing else — because we'd rather be excellent at two treatments than average at ten. But we like keeping an eye on the wider industry, because an informed patient makes better decisions no matter which treatment they end up choosing. If texture, tone, or sun damage are what's bothering you, a free consultation with us will tell you honestly whether CO2 or IPL is the right fit, or if neither is.

Common questions

Is jaw-slimming Botox already available? Yes — many injectors already offer it off-label. FDA approval would make it official but wouldn't change availability much.

How is this different from Botox for wrinkles? Different muscle, different dosing, different goal — this targets the masseter chewing muscle to change facial shape, not expression lines.

Will it affect chewing? Providers dose to reduce muscle bulk while preserving normal chewing function, but this is exactly the kind of question worth asking a qualified injector directly before treatment.

Does Cor.e Laser Studio offer this treatment? No — we focus exclusively on CO2 laser resurfacing and IPL. For injectables, see a licensed injector; for texture, tone, or sun damage, we're happy to help.