Instruction: 1, gargle: If you have aphtha, clean your mouth with mouthwash. Commonly used mouthwashes include chlorhexidine solution and chlorhexidine solution. It is mainly used for diminishing inflammation, relieving pain and preventing secondary oral infection. 2, the drug film: the drug film contains antibiotics and cortisone, which can promote the rapid healing of aphtha. Dry the ulcer first, and then stick the medicine film on the ulcer surface, which can protect the ulcer surface and promote healing. 3, cauterization: this method is not suitable for erosive oral ulcers, patients should use it with caution, cauterization is suitable for early oral ulcers. Dip a cotton ball in a tincture of 50% triacetin or iodophenol solution and put it on the ulcer surface until it turns white. This method can promote the precipitation of protein on the surface of ulcer and the regeneration of mucosa. 4. Buccal tablets: The effect of buccal tablets is similar to that of mouthwash, such as Huasu tablets, Caoshanhu tablets and watermelon frost tablets.