The jawbone is known medically as the mandible and in some cases where genetics are not the cause, this can change its shape from injury, trauma or certain medical conditions.

The masseter muscle is located at each side of the jaw and controls the opening and closing of the mouth. Genetics can also influence the size of this muscle, but it can become enlarged when it is overused. Excessive chewing (such as with those who frequently chew gum) can encourage the muscle to grow, as can some habitual conditions such as bruxism (teeth grinding) and jaw clenching.

Treatments that work to re-contour or reshape the jawline can be used to create a more streamlined look to the lower part of the face. At Nassif MedSpa dermal fillers can be administered to various points along the jawline or chin, bringing a more balanced and harmonious look.

If the masseter muscle has become larger, applying toxin directly into the muscle can help to relax the muscle and stop it from over contracting, which also effectively helps to stop the involuntary actions of grinding your teeth and clenching the jaw.