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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..
Your masseter muscle is your primary chewing muscle â not the only one, but the main one â and it covers the sides of the jaw just behind the cheeks. Itâs also the main muscle that clenches your jaw and grinds your teeth, unfortunately, and itâs one of the most common locations for trigger points in the human body.our masseter muscle is your primary chewing muscle â not the only one, but the main one â and it covers the sides of the jaw just behind the cheeks. Itâs also the main muscle that clenches your jaw and grinds your teeth, unfortunately, and itâs one of the most common locations for trigger points in the human body.