The ulcer produced by biting is because after the mucous membrane is broken, the mucous membrane will have a healing process, and the epidermis of the mucous membrane in the middle of this process will behave as an ulcer until it is completely healed, and pain will occur. Therefore, the ulcer produced by biting is also a non-specific mouth ulcer, which is similar to the performance of ordinary mouth ulcers. If such ulcers appear, treatment can also be local application of anti-inflammatory drugs, or local application of drugs to promote healing, and to avoid biting through the mucosa again in the future.