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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..
also known as the trifacial or trigeminal nerve; the largest of the cranial nerves; it is the chief sensory nerve of the face, and serves as the motor nerve of the muscles that control chewing.