Cimetidine does not treat mouth ulcers, mainly used to inhibit gastric acid secretion and other symptoms, if due to excessive gastric acid secretion reflux burning stimulation of the mucous membrane in the mouth caused by mouth ulcers, with this drug may have an indirect therapeutic effect, it is recommended that the mouth ulcers to the stomatology department for specific examination and treatment. 1. Cimetidine mainly inhibits gastric acid secretion, relieves acid reflux, stomach pain and other symptoms, and cannot treat mouth ulcers. Individual mouth ulcers, if caused by gastric reflux burning of the oral mucosa, may be able to relieve gastric symptoms with cimetidine while alleviating the symptoms of mouth ulcers or achieve an indirect therapeutic effect. Mouth ulcers are usually treated with topical healing medications, vitamin supplements, or removal of the local irritation. It is recommended that mouth ulcers be examined by a dentist and that medications be administered as prescribed.