Helicobacter pylori can enter the human stomach from the oral cavity through unclean eating habits, oral transmission, fecal-oral transmission and other ways, leading to infection. 1. Unclean eating habits: If you have the habit of eating raw food, such as raw fish, steak, raw vegetables, etc., without high temperature sterilization, there is a possibility of infection by bacteria such as H. pylori; in addition, going to some unhygienic restaurants may also increase the chance of infection. 2. Oral transmission: Since H. pylori may survive in the oral cavity, the chance of bacterial transmission is greatly increased when many people get together and do not use chopsticks; in addition, if one of the partners is infected with H. pylori, kissing between the partners is also a common way of oral transmission. 3. Fecal-oral transmission: If you are infected with H. pylori, the bacteria will be present in your feces, and if you don’t pay attention to your personal hygiene, you may be infected through contact with others. If H. pylori infection occurs, it is recommended to go to a regular hospital in time for treatment.