Botox to slim the jaw: what to know

The masseter muscles sit at the sides of the jaw and become prominent in some people who clench or grind their teeth or naturally have strong chewing muscles. Injections placed into these muscles reduce their activity for a time, which may gradually soften their visible bulk. A broad lower face can also reflect bone structure, soft tissue or skin laxity; jaw Botox will not correct those causes. The clinician should examine your bite, chewing strength and facial balance before recommending it.

Mention teeth grinding, jaw pain, swallowing problems, neuromuscular conditions, pregnancy or breastfeeding, allergies and all medicines. After injections, follow instructions about touching the area and strenuous activity. Tenderness, bruising, temporary chewing fatigue or a change in smile can occur. Eat foods that are comfortable if chewing feels tired, and arrange review if the result seems uneven. [Botox](/treatments/injectables/botulinum-toxin-injection/) uses [Botulinum Toxin Type A](/materials/botulinum-toxin-type-a/); [Dermal Fillers](/treatments/injectables/dermal-fillers/) work through a different mechanism.

Contact the clinic for worsening jaw pain, marked swelling, increasing redness, discharge or difficulty opening the mouth. Seek urgent help for trouble breathing or swallowing, rapidly spreading weakness, or a severe allergic reaction. New facial weakness, persistent difficulty chewing or a sudden change in your bite should be assessed rather than managed with another injection.

Is muscle bulk the main reason my jaw looks broad? Could treatment affect chewing or my bite? What alternatives fit my facial structure? How will you assess symmetry and follow the result?