Cheek biting may be caused by abnormal tooth position and occlusal relationship or excessive tooth wear. 1. Teeth erupt in an abnormally tilted position, or the maxillary teeth cover the mandibular teeth too much, and there is a gap between the maxillary and mandibular teeth will appear to bite the cheek. It is especially likely to happen when oral prostheses are present. It can be improved by orthodontic correction. 2. Teeth in the process of eating different degrees of wear and tear, the tip of the sharp teeth will also appear to bite the cheeks, can be properly adjusted to grind the tip of the teeth. Otherwise, long-term stimulation will cause ulcers in the oral mucosa. Always bite the cheeks of the situation if the persistence of the situation, need to go to the stomatology examination and the doctor to determine how to carry out the treatment.