What happens to your jaw when you stop getting masseter Botox?
Medically reviewed by
The LovMedSpa medical team, led by Dr. Ahmed Elsoury, MD and Mark Ennett, PhD, CRNA
Last reviewed: August 2026
The muscle comes back. Not overnight and not usually all the way, but the slimming reverses over roughly six to twelve months after your last treatment as the masseter regains its former bulk and function once the neuromodulator (botulinum toxin type A, which works by temporarily blocking the nerve signal to the muscle) wears off.
How much comes back depends on how long you were treated
Someone who did two or three rounds returns close to baseline. Someone treated consistently for three or four years often keeps a partially slimmer lower face, because sustained reduced use produces some lasting atrophy (a reduction in muscle volume from disuse) and the overlying skin has adapted to the smaller contour.
The part nobody warns about is chewing. During the first two to four weeks of a treatment, and again during the first weeks of stopping, the bite feels different. Steak, bagels, and anything requiring sustained force feel harder than they should. That is normal and it settles.
Why your reason for starting determines what stopping means
There is a distinction worth making. If you started masseter Botox for jaw clenching or TMJ pain, stopping means the clenching returns and often the headaches and tooth wear with it. That is a functional problem and it does not resolve on its own. If you started purely for facial slimming, stopping is cosmetic only and the only consequence is your original jawline.
One caution about aggressive dosing
Aggressive or repeated high dose treatment can, in some patients, produce a hollowed look at the cheeks or a paradoxical bulge at the jaw angle when the muscle recruits differently. Dosing conservatively and reassessing at two weeks avoids most of this.
Common questions
How long does it take for the masseter muscle to come back after stopping?
The slimming reverses over roughly six to twelve months after your last treatment as the masseter regains its former bulk and function. It does not happen overnight, and it usually does not come back all the way, particularly after several years of consistent treatment.
Will my jaw clenching or TMJ pain return if I stop?
If you started masseter treatment for jaw clenching or TMJ pain, stopping means the clenching returns, and often the headaches and tooth wear with it. That is a functional problem and it does not resolve on its own. If you started purely for facial slimming, stopping is cosmetic only and the only consequence is your original jawline.
Does long-term masseter treatment leave lasting slimming?
Often, partially. Someone who did two or three rounds returns close to baseline, but someone treated consistently for three or four years often keeps a partially slimmer lower face. Sustained reduced use produces some lasting atrophy, and the overlying skin has adapted to the smaller contour.
Masseter treatment at LovMedSpa is dosed to the individual muscle rather than a fixed unit count, under the oversight of medical director Dr. Ahmed Elsoury, MD (New York and Connecticut) and Mark Ennett, PhD, CRNA (South Florida), available across our Brooklyn, Manhattan, Staten Island, Aventura, and West Farms locations. A consultation is the best way to decide whether to stop, taper, or adjust dosing for your goals and your bite.
This is general information, not medical advice; candidacy and dosing are determined by a licensed provider at consultation.