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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..
Keeping these muscles in motion will not only prevent building up of excess fat under your chin, but also improve your jaw line. The only criteria this exercise would involve is the love for chewing gums.