Oral ulcer is difficult to prevent, because it is a disease with great individual differences, and everyone may have different incentives. So if you want to really prevent this disease, you must try to find out the main causes of your own oral ulcer, and then take necessary measures to block the possibility of inducing it, so as to reduce the possibility of ulcer. For example, patients can go to the hospital for a detailed physical examination, focusing on the immune system and digestive system, because these problems can induce oral ulcers. In addition, we should try to find out whether there are some bad habits before the occurrence of oral ulcers. For example, every time we eat chili, oral ulcers are particularly easy. It is likely that eating chili is the main incentive to stimulate oral ulcers. In the future, we should eat less chili or not, so as to reduce the incidence of ulcers. Of course, patients should also live a healthy life at ordinary times, quit smoking and drinking, work and rest regularly, and have a happy attitude. These are all good practices for preventing oral ulcer.