Mouth ulcers always recurring may be caused by low immunity, lack of vitamins, repeated damage to the oral mucosa. It can be treated by strengthening the body, adjusting the diet and medication. 1. Enhance physical fitness: oral ulcers recur due to decreased immunity caused by overwork, emotional depression, and repeated exposure to cold. Patients need to enhance their physical fitness, drink more water and exercise regularly to promote the body’s metabolism. 2. Adjust the diet: If the body is relatively lack of vitamins, it will also lead to repeated episodes of mouth ulcers. Patients should eat a light diet, eat more vitamin-rich fruits and vegetables to improve their immunity. 3. Medication: Repeated chewing of hard and dry food or long-term damage to the oral mucosa by braces may lead to recurrent mouth ulcers. You can use cediriodine tablets and other drugs for treatment, note that the drug must be used under the guidance of a doctor. Patients with recurrent mouth ulcers should go to the hospital in time and follow the doctor’s instructions for treatment. At the same time, pay attention to oral hygiene, maintain a healthy and regular life.