H. pylori can be reinfected after it is cured. Re-exposure to bacteria after H. pylori eradication can still cause re-infection when the body’s immunity is low. Paying attention to reducing the number of meals, strict meal sharing, etc., can effectively reduce the chances of infection. H. pylori is mainly transmitted through the fecal-oral route, and diet is the most important way of transmission. Even after H. pylori eradication treatment, re-infection can still occur through meals and unclean eating habits. Strictly enforcing the meal portioning system in daily life is conducive to minimizing the spread of bacteria and avoiding cross-infection. Since H. pylori is mainly transmitted through public meals and other dietary routes, it is recommended that family members be tested for H. pylori and treated promptly for H. pylori eradication if positive.