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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..
Saliva is produced and secreted by major and minor salivary glands lining the inner lip and soft palate. Chewing is the most efficient way to stimulate salivary flow. It causes muscles to compress the salivary glands, releasing saliva.