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What Are the Side Effects of Botox in Masseter Muscle?

May 2, 2025

BOTOX for Masseter Reduction

Individuals with a square or masculine jawline can benefit from BOTOX masseter injections at Body+Beauty Lab in Philadelphia, PA. Learn about the benefits and potential side effects.

Procedure Overview

Injections are performed in minutes during a consultation where our experienced providers evaluate your face and cosmetic goals. Treatment areas are marked, and BOTOX is administered to relax the masseter muscles. There’s minimal discomfort, no downtime, and patients can resume normal activities, avoiding strenuous exercise or jaw pressure for the day.

Results and Recovery

Initial results appear in 7–10 days, with the jawline slimming as the masseter muscles relax and atrophy over weeks. The masseter muscles, located on each jaw side, are key for chewing. Enlargement from genetics or overuse (e.g., teeth grinding) can create a square jawline. BOTOX shrinks the muscle, creating a more V-shaped face.

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