At present, the specific cause of mouth ulcers is not clear, so mouth ulcers are not particularly effective, and can break the root of the drug. Mouth ulcers are mainly divided into oral recurrent ulcers, oral traumatic ulcers, cancerous ulcers and so on. 1. The cause of recurrent oral ulcers is still not clear, may be related to genetic, immune, environmental factors, etc., about its treatment is mainly used to alleviate pain, promote the healing of the symptomatic treatment to shorten the course of the disease, but will still recur, there is no root cause of the drug. 2. Oral traumatic ulcers can be cured by removing the traumatic stimulus without medication. 3. Cancer ulcers require surgical treatment, and medication is ineffective. It is recommended to go to the stomatology department of regular hospitals for consultation and clear diagnosis after examination by physicians and symptomatic treatment according to the cause of the disease.