Montmorillonite powder is mainly used for the treatment of acute and chronic diarrhea in adults and children, there is no research to show that it has a therapeutic effect on mouth ulcers, so you can not use montmorillonite powder to treat mouth ulcers. Montmorillonite powder is a natural montmorillonite particles powder, the pathogenic bacteria in the digestive tract has a strong inhibitory effect, but also can protect and repair the mucosa of the digestive tract, thus playing a balance of normal flora and local pain relief, but there is no treatment for mouth ulcers. Patients with mouth ulcers can use local topical drugs for treatment, such as ice boron, lidocaine drugs, etc., all with good efficacy. If the mouth ulcers continue to be unrelieved, or accompanied by other serious discomfort, you should consult a doctor in a timely manner, under the guidance of a professional doctor to identify the cause of the disease, and comply with the doctor’s instructions for the appropriate treatment of drugs, so as to alleviate the relevant symptoms.