Mouth ulcer patches are first cleaned off the surface of the ulcer before being applied, then the side with the medication is applied to the ulcer surface and then pressed gently to make full contact between the patch and the ulcer surface. Mouth ulcers have a high incidence, often recurring, most of them are self-limiting, i.e., can be self-healing, but there are also some delayed and intense pain. Oral ulcer patches can promote ulcer healing and have the effect of pain relief, if the use of the process of feeling uncomfortable, should be discontinued in a timely manner. If the ulcer symptoms are not relieved, or accompanied by other symptoms, you should go to the hospital. Adverse reactions and contraindications of oral ulcer patches are not clear, pay attention to avoid smoking, alcohol, spicy and other foods, it is recommended that under the guidance of a doctor to carefully read the instructions for the use of drugs.