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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..
8 incisors are anterior teeth, 4 in the upper arch and 4 in the lower. Their function is for shearing or cutting food during chewing. There are no cusps on the teeth. Instead, the surface area of the tooth used in eating is called the incisal ridge or incisal edge.