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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..
Muscles attached to and surrounding the joint control the movement of the jaw, allowing us to talk, chew, yawn and perform other functions with our mouths. Many people experience TMJ disease, which causes facial pain; jaw clicking, popping and locking; earaches; headaches; bite problems; and other unpleasant symptoms.