Oral ulcers, commonly referred to as “oral inflammation” or “oral sores” among people, are isolated or multiple oral mucosal ulcers that occur irregularly or periodically in any part of the oral mucosa. It can be self-healing and can occur in any part of the oral mucosa. Most of them are found in the mucous membranes of the lips, cheeks, soft palate, or gums of the oral cavity. Single or multiple round or oval ulcers of various sizes occur, the surface is covered with gray or yellow pseudomembrane, the center is depressed, the boundary is clear, and the surrounding The mucous membranes are red and slightly swollen, and the local ulcers have obvious burning pain, which is periodic, recurrent, and self-limiting. In severe cases, it will also affect appetite. The prevalence rate ranks first among oral mucosal diseases. Although the disease is not life-threatening, the local burning pain of the ulcer is obvious, hindering diet and speech, which can affect people’s body and mind, work and quality of life to varying degrees, and takes up a lot of limited medical resources. Cause great inconvenience to daily diet. About 1/5 of people have experienced oral ulcers. It occurs mostly in young adults, usually on the lips, tongue, or other parts of the mouth. Many people use “getting angry” to explain oral ulcers. In fact, the causes of oral ulcers include many aspects. For example, diseases of the digestive system, endocrine changes, mental factors, nutritional factors, including genetic factors may lead to oral ulcers.