Montmorillonite powder for mouth ulcers is not true, this drug is mainly used for the treatment of diarrhea, and should not be applied arbitrarily. Montmorillonite powder is a natural montmorillonite particles powder, in the clinic is mainly used for adults and children with acute and chronic diarrhea; after the use of the drug, some patients may experience constipation adverse reactions. The contraindications of this drug are not clear, but in the use of the drug need to pay attention to, in the treatment of acute diarrhea, attention should be paid to the timely correction of dehydration; symptoms of constipation, can reduce the dose of application; allergic to this product, prohibit this drug; allergic to people, use this drug with caution; after the use of the drug, the emergence of any adverse reaction, should be as early as possible to seek medical treatment. If you need to apply montelukast, you must consult a doctor to confirm the diagnosis and follow the doctor’s instructions. For patients with mouth ulcers, they should consult a doctor to confirm the diagnosis of their condition and follow the doctor’s instructions for treatment, and should not use medication arbitrarily.