I. Etiology The most common disease causing oral ulcers is recurrent oral ulcers, followed by traumatic ulcers caused by some local irritants such as root stumps, crown stumps, chemicals, temperature stimulation, etc. There are also some systemic diseases and syndromes in the oral cavity. Such as anemia, vitamin deficiency, leukodystrophy, radiation stomatitis, Crohn’s disease. Second, precautions The cause of recurrent mouth ulcers is still undetermined, so it can not be cured. However, if patients pay attention to nutrition and health care, balanced diet, actively participate in physical exercise, remove the causative factors, remove possible pathogenic factors (such as mental tension, environmental changes, lack of sleep, etc.), treat some systemic diseases associated with mouth ulcers (such as gastric ulcer, duodenal ulcer, liver and gallbladder diseases, etc.), reduce local stimulation and maintain oral hygiene, they can prolong the interval between ulcer recurrence and shorten the healing time. How to cure oral ulcers? Mouth ulcer is a common oral mucous membrane disease, also known as mouth sores, pain is very obvious when attacked, and can heal itself without treatment. There are also recurrent attacks, called recurrent mouth ulcers, which have a great impact on the work and life of patients. The exact cause of mouth ulcers is still inconclusive, but its occurrence is related to many factors, such as reduced cellular immune function; digestive system diseases such as bloating, diarrhea or constipation; endocrine changes; mental factors such as mental stress and poor sleep conditions; and other factors such as lack of trace elements zinc, iron, folic acid, vitamin B2 and genetics. To eradicate mouth ulcers, the fundamental way to start is to enhance physical fitness and improve immunity. People who often suffer from mouth ulcers should pay attention to the following in their lives: psychological adjustment to achieve relief and optimism; maintain oral and skin hygiene, adhere to frequent brushing, rinsing and bathing; pay attention to smooth bowel movements and adequate sleep; pay attention to nutritional mix, eat more fresh fruits and vegetables to clean the stomach, avoid chewing gum, chocolate, tobacco, alcohol, coffee, hot food and spicy barbecue, fried products and other products that can easily trigger or aggravate mouth ulcers.