In addition to smoothing wrinkles, Botox can be used to slim and contour the face. This can be done by targeting the masseter muscles at the back of the jaw. These muscles can give the face a square shape. This procedure is referred to as masseter reduction. Sometimes it can be done together with buccal fat pad removal to enhance the result if the cheeks are chubby.

Same treatment is used in patients with bruxism (clenching or grinding teeth) which is an involuntary movement that can occur either while awake or asleep. Many people suffer of it for years without even realising it. Usually they have damaged abraded teeth, can have pain and hypertrophic growth of the muscles attached to the jaw and therefore a wider square-looking face.