The following four treatments can be taken after a gum ulcer: First, apply furacilin paste locally or spray watermelon cream to relieve pain and promote healing of the ulcer. Second, you can use a mouthwash containing iodine and rinse your mouth six times in the morning and evening, which can also achieve the purpose of promoting ulcer healing. Take vitamin B and vitamin C orally to improve the body’s resistance ability. Fourth, you can take immunomodulatory drugs, such as transfer growth factor, can also achieve the purpose of regulating immunity. Because mouth ulcers are mainly caused by low immunity, there is generally no exact treatment means after a relapse, but a combination of Chinese and Western medicine can be taken and may be able to cure the ulcer.