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Cheek biting can result from muscle atrophy in the face, which affects the cheeks' ability to maintain their shape. Cheeks become more susceptible to being bitten as they sag inward towards the mouth. Adjusting chewing techniques may help minimize cheek biting.
People who grind their teeth at night, a condition known as bruxism, might find some relief from overnight cheek biting by using a dental appliance called a mouthguard. This device helps keep the cheeks away from the teeth.