There are many factors that can cause recurrent mouth ulcers in the elderly, which may be caused by mental factors, food intolerance, lack of nutrients, and also reduced immune function. Different causes of different treatment modalities, such as maintaining oral hygiene, dietary adjustments, medication and other ways. 1. Maintain oral hygiene: You can use mouthwash after meals to keep your mouth clean and brush your teeth on time to ensure oral hygiene. 2. Adjust the diet: you can eat more vitamin-rich fruits and vegetables, remember to smoke less and drink less, maintain sleep, slow down the pressure of work. 3. Drug treatment: you can use vitamin B, tretinoin oral cream, watermelon cream spray, dexamethasone acetate oral patch and other drugs for treatment. In addition, Chinese medicine can also be used in the way of treatment. The above drugs are for reference only, the specific use should be used under the guidance of a doctor. It should be noted that, when the elderly recurrent mouth ulcers, should go to the hospital in a timely manner for examination, clear cause, under the guidance of the doctor for appropriate treatment.