Recurrent mouth ulcers are not necessarily AIDS. As long as the recurrent mouth ulcers do not occur in the same location, for example, this time on the buccal mucosa and the next time on the floor of the mouth or on the gums, there is no need to worry. Recurrent oral ulcers are clinically known as recurrent oral ulcers, which are a very common disease and a frequent occurrence in the mucosal diseases of dentistry, and are characterized by recurrent attacks and unequal intervals. The pathogenesis of recurrent oral ulcers is not clear, caused by a variety of factors such as indigestion, bacterial infection, mental stress, local trauma and vitamin and trace element deficiencies, in addition to hospital to exclude leukoplakia.