The masseter muscle originates in the lower third of the face and plays a role in chewing. Overactivation of this muscle due to factors such as teeth grinding (bruxism), anxiety, and clenching leads to muscle hypertrophy. The enlargement of the masseter muscle can give the jaw a more square appearance, making patients look more masculine. This square shape may be desirable for men but is often less attractive to women. Masseter botox is an effective treatment to reduce muscle hypertrophy, decrease the size of the muscle tissue, and help patients regain their desired facial angle. Botox treatment is also desirable for patients who suffer from headaches due to frequent teeth clenching. Blocking the overactive muscle with injections allows it to relax, helping patients stop clenching and grinding. After treatment, patients are often satisfied with their well-shaped and angled face.