You can use montelukast during mouth ulcers, but montelukast has no therapeutic effect on mouth ulcers, if you are taking other medications for mouth ulcers, you need to consult a physician or pharmacist before using montelukast. The main ingredient of montmorillonite powder is montmorillonite, which is used to treat acute and chronic diarrhea in adults and children, and has no therapeutic effect on mouth ulcers. The drug is taken orally, note that children need to strictly control the dosage when taking. A small number of people taking Montelukast may have an adverse reaction of mild constipation, and it is contraindicated for those who are allergic to this product. There are also many precautions associated with this drug, and it is recommended that it be taken under professional guidance. General treatment of mouth ulcers can be contained cidi iodine tablets, or the use of ice boron powder, watermelon cream and other dispersions such as local spray on the affected area. The specific use of medication to follow the doctor’s instructions, should not be self-medication.