Small children’s bad breath is not necessarily Helicobacter pylori infection, but may also be related to digestive tract diseases, oral inflammation and other factors. 1. Helicobacter pylori: When children are infected with Helicobacter pylori, they will have bad breath, and also accompanied by abdominal pain, heartburn, acid reflux and other adverse reactions. It can be treated with triple therapy (one acid-suppressing drug plus two antibiotics). 2. Gastrointestinal diseases: children with digestive diseases, such as chronic gastritis, constipation and other conditions, bad breath can also occur. It is necessary to consult the doctor in time and treat under the guidance of the doctor. 3. Oral inflammation: due to the lack of attention to oral hygiene, resulting in food debris long-term retention around the teeth, leading to fermentation and eventually decay, there will also be bad breath. There may be other causes of bad breath in children, it is recommended to go to the hospital in time for relevant examinations to clarify the cause of the disease and then actively treat the symptoms.