Mouth ulcers caused by eating too much betel nut should stop chewing betel nut. Betel nut alkali is irritating to the mucous membrane, chewing will irritate the oral mucous membrane and form ulcers. For mouth ulcers caused by betel nut chewing, anti-inflammatory and pain-relieving medications that promote ulcer healing can be used locally on the ulcers, such as tretinoin oral ointment, mouth ulcers, healing new liquid, etc., to promote the healing of mouth ulcers. After the occurrence of mouth ulcers should stop chewing betel nut, the oral mucosa has the function of self-repair, coupled with the use of drugs to promote the healing of ulcers, such as cediriodine tablets, watermelon cream. The use of medication should be in accordance with medical advice. It is recommended to consult a doctor for ulcers caused by betel nut to rule out cancerous lesions. If the ulcers are caused by betel nut chewing, it means that the oral mucosa is very sensitive to betel nut and should stop chewing betel nut. Even if betel nut does not cause mouth ulcers, long-term chewing of betel nut may cause submucosal fibrous lesions, which may lead to further cancerous lesions, thus affecting the health of the body, and therefore should be avoided.