1. “Stay positive and optimistic, and face each day happily.” This seems to be something that we insist on every day, and it is also something that we often hear persuaded and taught. Indeed, maintaining an optimistic state of mind is also a way to prevent mouth ulcers, to avoid anxiety, irritability and other moods, have a good mood to have the motivation to prevent disease. 2.Eating and drinking, living a good life. Keep the habit of early to bed and early to rise, diet to keep the guard, clean, regular living, do not stay up excessively, keep enough sleep. At the same time, to maintain active physical exercise, strengthen their own immunity, can take oral VB and VE to prevent and treat mouth ulcers. 3, usually the diet should pay attention to light, eat more vegetables and fruits, keep enough water every day, drink more water. Oral guards should pay attention to avoid eating spicy food and reduce the stimulation of such food to the mouth to prevent mouth ulcers. 4. Under the premise of maintaining sufficient sleep, do not overwork, balanced diet and nutrition, and supplement the trace elements that cause mouth ulcers. Develop reasonable bowel habits once a day with a large daily. 5.Be calm when things go wrong, do not be angry and hurt your body, resulting in mouth ulcers. Encounter mouth ulcers to clarify whether they are benign mouth ulcers or malignant, and be prepared to seek medical attention in a timely manner. Benign mouth ulcers often recur, ulcer surface variable; while malignant mouth ulcers but no history of recurrence, an onset of delayed healing.