Recent mouth ulcers can be caused by a variety of reasons, such as recent mental stress or hormonal changes, or vitamin and trace element deficiencies, and may also be caused by low body resistance and immune deficiency. In addition, there may be seasonal causes, and if there are localized root remnants or bad restorations that irritate the oral mucosa, it is also easy to have long-term symptoms of oral ulcers, so timely examination and diagnosis should be made and targeted treatment should be given. If ulcers appear in the mouth, promptly give drugs to promote healing, commonly used are trenbolone ointment, or you can use compound cortical dispersion, tin dispersion, watermelon cream spray, you can also use open throat sword spray, in addition, you can also use mouthwash, such as compound boric acid solution or compound chlorhexidine gargle, to promote the healing of ulcers in the mouth and maintain oral hygiene.