Mouth ulcers are light colored ulcers on the tongue, lips, gums or oral mucosa. Mouth ulcers are usually caused by genetic factors, nutritional factors, systemic disease factors, and mental factors. The appearance of mouth ulcers should eat more fruits rich in vitamins to facilitate the healing of the ulcer surface. Most patients with mouth ulcers are caused by the lack of some trace elements. So it is recommended to use some vitamin-rich fruits. For example, pear, pear is rich in vitamin B and water, which is very beneficial to patients with mouth ulcers; apple, apple is also a vitamin-rich food; persimmon, persimmon is always considered the best fruit to prevent and control mouth ulcers, which is beneficial to the healing of ulcer surface; watermelon, watermelon is usually recommended to squeeze out the juice in the mouth, which has a very good effect on the healing of ulcer surface of mouth ulcers. When the organism has mouth ulcers, if the ulcer surface is relatively small, it can be relieved by maintaining oral hygiene, drinking more water and eating fresh fruits, and it is also recommended to gargle with mouthwash in the morning when waking up and going to bed, but pay attention to the temperature of the water. If the mouth ulcers are large, it is recommended to apply Yunnan Baiyao or Nourishing Yin and Myosin, etc., two to three times a day, and the ulcers will heal in about three days to a week. Patients are advised to take the appropriate plan according to the size of the mouth ulcer. Generally speaking, mouth ulcers can heal on their own in about a week. If there are ulcers in the mouth that do not heal on their own for more than 2 weeks, it is necessary to visit a regular oral medical institution to investigate whether they are cancerous.