A mouth ulcer is an ulcerative disease that occurs on the oral mucosa, the cause of which is unclear and is recurrent and self-healing. Generally the automatic healing cycle of mouth ulcers is two weeks, it is very normal that the ulcer is not well for a week because it has not reached the time of automatic healing, and it will heal after another week of observation. If you want to shorten the cycle of mouth ulcers, you can spray drugs locally, such as watermelon cream, Yunnan Baiyao or open throat sword spray, these drugs help the ulcer surface to heal and reduce pain. Chlorhexidine can also be used to rinse the mouth, which can effectively reduce the bacterial content in the mouth and prevent the ulcer from becoming infected. In addition to this, you can also carry out systemic immunity and resistance improvement, such as oral pidomod, transfer factor, etc., and active physical exercise, which can make the number of ulcers reduced.