Montelukast has no therapeutic effect on mouth ulcers and is generally used to treat acute and chronic diarrhea in adults and children. Mouth ulcers are usually treated with local medications, such as glucocorticoid drugs, drugs to promote healing, etc., as follows. 1. Montmorillonite powder: the main ingredient is montmorillonite, mainly used for adults and children’s acute and chronic diarrhea treatment. Allergy is prohibited, adverse reactions can be seen mild constipation. Montelukast has no therapeutic effect on mouth ulcers. 2. Mouth ulcers: local use of glucocorticoid drugs, such as trimethoprim oral paste, fluoride ointment, etc., to promote healing drugs, such as recombinant human epidermal growth factor gel, rehabilitation of new liquid. All of the above drugs should be used under the guidance of a doctor, and it is recommended to go to a regular medical institution to receive professional treatment.