If the mouth is prone to mouth ulcers, it is mainly due to the following reasons: First, due to the lack of vitamins and trace elements in the body, common in people who are picky eaters and partial eaters, because the body does not have enough vitamins and trace elements, especially vitamin C, vitamin B, vitamin A and vitamin E, as well as the lack of iron and zinc in trace elements, are particularly prone to suffer from mouth ulcers. Second, due to irregular habits of life and rest, common in people who like black and white, stay up late, such people will have different degrees of immune dysfunction, which leads to recurrent mouth ulcers. Third, the daily diet is incorrect, such as long-term preference for spicy, greasy food, due to spicy, irritating food directly to the oral mucosa caused by stimulation, thus causing the oral mucosa from time to time with the appearance of mouth ulcers. Fourth, too many pathogenic factors in the mouth, for example, there are many teeth in the mouth suffering from caries, pulpitis, periodontitis or wisdom teeth pericoronitis and other diseases, without timely treatment, the number of pathogenic factors in the mouth will increase significantly, which will also make the symptoms of mouth ulcers occur repeatedly. Fifth, due to the extreme disorder or low immune function, it will also make the mouth ulcers appear repeatedly.