The white membrane on the mouth ulcer is called the false membrane, the false membrane scraped off will not heal faster, but will cause severe pain, and cause secondary infection of the ulcer, want to promote the healing of the ulcer generally use medication. Ulcer is due to the body’s own factors or external damage caused by mucosal epithelial defects or destruction, the surface of the pseudomembrane scraped, will cause severe pain and aggravate the inflammation of the ulcer, want to promote the healing of the ulcer as soon as possible, clinically generally need to comply with the doctor’s instructions to use medication for treatment. Can follow the doctor’s instructions to take iodine tablets, local use of lidocaine gel or dexamethasone ointment and other drugs to promote the healing of ulcers. When mouth ulcers appear, it is also necessary to remove external stimuli, such as grinding sharp teeth, modifying bad restorations, and eating less hard objects. The above drugs need to be used in accordance with the doctor’s instructions, mouth ulcers patients need to consult a doctor in a timely manner, under the guidance of the doctor for treatment.