Children’s bad breath may be infected with Helicobacter pylori, or it may be caused by indigestion and not paying attention to oral hygiene, etc. The specific analysis is as follows. 1. Infection of Helicobacter pylori:When a child is invaded by Helicobacter pylori, the Helicobacter pylori will survive in the tartar and directly produce smelly carbons, resulting in bad breath, which can be treated under the guidance of a doctor, such as triple therapy (an acid-suppressing drug plus two antibiotics). 2. Indigestion: If children eat too much or eat a lot of food that is not easily digested, causing accumulation of food, indigestion, gastrointestinal food is not digested adequately, producing a lot of gas reflux through the esophagus, bad breath can also occur, usually accompanied by abdominal distension and loss of appetite. 3. not pay attention to oral hygiene: such as children do not brush their teeth or brush their teeth seriously without brushing clean, food residues left in the teeth over time fermentation, will lead to bad breath. Children’s bad breath can also be caused by gingivitis, tonsillitis, dental caries, gastritis, constipation, etc. It is recommended to go to the hospital in time for relevant examinations to clarify the cause of the disease and actively treat the symptoms.