The main reasons for the frequent growth of ulcers in the mouth are the following: 1. caused by poor dietary habits. The main reason for this is that the mucous membrane is prone to ulcers due to mechanical or physical stimulation. 2, due to incorrect work and rest schedules, people who like to stay up late, black and white will have immune dysfunction, and these people also love to grow ulcers. 3, due to paranoia, picky eating, do not love to eat fresh vegetables and fruits, resulting in the lack of vitamins and trace elements in the body, is also 4.If there are caries, periodontitis, wisdom tooth pericoronitis or bad restorations in the mouth, these inflammations will lead to the increase of pathogenic bacteria in the mouth, and if the bad restorations can often scratch or bite the mucous membrane, it will also lead to the cause of ulcers.