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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..
The facial muscles detailed below are the main muscles used in facial reconstruction. The facial muscles can be divided into two groups: the muscles of mastication and the muscles of facial expression. The muscles of mastication are the ones we use when we chew.