After quitting smoking caused oral ulcers, considering the long-term smoking suddenly quit, oral mucosal surface keratinization degradation, oral on fire ulcer formation. This situation has a certain self-limiting, can be gradually recovered, this time to eat more vegetables and fruits, supplemental vitamin C can accelerate the healing of the ulcer. In addition, drink more water, eat less spicy and greasy food, if it affects the normal diet, you can use mouth ulcer paste or mouth ulcer spray, with the use of fire medication such as ox-huang detoxification tablets, Huanglian Shangqing tablets. Must be reasonable work and rest, avoid excessive exertion, especially can not stay up all night, maintain emotional stability, if two weeks after the ulcers are still relatively large, should be recommended to go to the stomatology department for detailed examination.