This cosmetic treatment is used on the lower face muscle, called the “masseter” or the muscle of the jaw. This muscle is responsible for chewing, and when overactive, leads to the problem with teeth grinding. The masseter is also responsible for the square look of the jaw, and while men may enjoy such a look, it’s not so in the case of women, who would prefer a softer look. Anti-wrinkle treatments are performed to reduce the size of masseter, and as a result, to provide the face with an oval, softer appearance. Furthermore, Anti-wrinkle treatments applied on the masseter can reduce the problem with teeth grinding.