Bad breath is not necessarily caused by Helicobacter pylori. There are many reasons for this, including Helicobacter pylori infection, oral diseases, nasopharyngeal diseases, and so on. 1. Helicobacter pylori infection: Helicobacter pylori can destroy the protective barrier of the gastric mucosa, causing gastritis, gastric ulcer and other diseases, which leads to digestive disorders, food retention in the gastrointestinal tract, its decomposition, fermentation of the gas produced by the mouth and out, resulting in bad breath. 2. Oral diseases: unclean mouth, tartar accumulation, chronic gingivitis, dental caries, etc., can make the oral cavity bacteria, microorganisms multiply, tartar on the teeth in the bacteria, microbial action, produce unpleasant odor, i.e., halitosis. 3. Nasopharyngeal diseases: purulent tonsillitis, sinusitis, etc., the odor produced can be transmitted through the oral cavity, resulting in halitosis. 4. Other: consumption of garlic and other foods can produce temporary bad breath; long-term smokers can also produce bad breath; organic poisoning patients will have a special odor in the mouth. There are many other reasons for bad breath, if the bad breath is not relieved, and accompanied by other symptoms, you should go to the hospital in a timely manner, clear reasons for targeted treatment.