Hi, Thank you for the query. Cheek bite is a most common problem among every individual. Cause for it varies ,may be due to a sharp margins formed due to attrition of the teeth in aging , due habits like tobacco chewing. Usually if left unattended it may lead to formation of cancerous lesion due to repeated trauma . Selective grinding in case of sharp or irregularity in teeth can be done.Another possibility is lack of proper occlusion when closing the mouth or biting or chewing the food. If it is because of improper occlusion then it requires corection of occlusion . Your dentist can diagnose the reason for the cheek bite and treat accordingly. Hope the information will help you.