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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..
This is a remarkably common problem, especially among the young. The muscles that allow you to chew (muscles of mastication) can be overworked and strained, the same as any other muscle in your body. If the muscles are well-toned, not weak, and not overworked/strained, this will not be a problem.