The masseter muscle found on the face helps with chewing food. Overworking the muscles can cause the face to appear larger due to the increased muscle size, creating a square face. Over time, the masseter muscle will continue to grow and can cause hypertrophy which can cause unevenness in the facial features. Additionally, grinding can also cause masseter muscles to be larger while causing pain.

To deal with this problem, Botox can help target the masseter muscle to relax the muscle and reduce the appearance of a strong jaw. Results will begin to appear within a month and can last for about 6-9 months.