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Quick Answer. Four muscles are used to chew food. They are the masseter, temporalis, medial pterygoid and lateral pterygoid. These muscles are responsible for the chewing action, moving the mandibles from side to side, grinding teeth and even helping us speak. They are also referred to as muscles of mastication..
Botox Jaw Reduction. The masseter muscle is the muscle in the jaw responsible for the chewing process. It is also the muscle that commonly causes a person to have a large, square-shaped jaw.euromodulator injections are commonly used to reduce the appearance of fine lines and wrinkles on the face, but here at Cosmetic Laser Dermatology in San Diego, our expert injectors can also inject Botox into the masseter facial muscle to slim the jaw and treat teeth grinding, also known as bruxism.