Helicobacter in the mouth is generally referred to as Helicobacter pylori. Mouthwash does not kill H. pylori in the mouth, and gargling alone does not kill H. pylori. Mouthwash only cleanses the mouth and can be used to prevent and assist in the treatment of oral diseases, it does not kill H. pylori. H. pylori is a bacterium that colonizes the acidic environment of the stomach and can be found in gastric juices, as well as in saliva, where it can be transmitted through the saliva route. In addition, H. pylori can also be excreted in the feces and transmitted to others through the fecal-oral route. In addition, to prevent H. pylori infection, it is important to pay attention to personal hygiene and avoid sharing utensils with infected people to minimize transmission via the digestive tract. Once you experience gastrointestinal symptoms, go to the hospital as soon as possible for testing of H. pylori infection.