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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 jaw muscles can be enlarged naturally, or commonly they enlarge with clenching or bruxing the teeth at night during sleep, or excessive gum chewing. If you wear a tooth guard at night or if your dentist tells you that you have excessive wear on your teeth, Botox to the jaw muscles help relax these muscles.