Throat-opening sword has a certain therapeutic effect on mouth ulcers. Throat-opening sword, as a spray of a proprietary Chinese medicine preparation, has a certain therapeutic effect on sore throat and mouth ulcers. But clinical observation, if the open throat sword can completely treat mouth ulcers is not realistic, because from the current clinical observation, no drug has been developed to completely cure mouth ulcers. Because mouth ulcer is a multifactorial combination of oral mucosal ulcer diseases, it includes immune, physical, genetic, hormonal and even psychological, all have a certain influence on the production of mouth ulcer. Therefore, mouth ulcers can be relieved by medication, but there is a tendency of frequent recurrence and there is no particularly good clinical experience to completely cure them.