Mouth ulcer is a disease caused by a variety of factors, the cause is unknown, the root cause is difficult to cure, if long-term suffering from mouth ulcers, can be treated by changing the lifestyle and taking drugs. First of all, we should change our eating habits, avoid spicy and stimulating foods, ensure a regular work and rest schedule, do not stay up late and get enough sleep, and secondly, avoid long-term mental stress and relax. Medications can choose local medications to relieve pain and promote ulcer healing, such as watermelon cream spray, lidocaine gel, epidermal growth factor, etc. You can also take Chinese medicines to clear heat and lower fire, such as honeysuckle, dandelion, raw licorice, mung bean soup, etc. If the ulcer in the mouth is very deep and large, painful and does not heal for a long time, systemic oral medication is needed, and the drugs chosen are hormonal drugs, vitamin B and C drugs, immune enhancing drugs, etc.