H. pylori infection can cause bad breath. Because H. pylori infection, H. pylori in the gastrointestinal tract or mouth can secrete the enzyme urease, and the breakdown of this enzyme produces carbon dioxide and ammonia, which is a rather unpleasant odor that can be excreted from the esophagus and mouth, many patients with H. pylori infection have bad breath. With ultrasonic cleaning, H. pylori bacteria can be reduced in the mouth, thus preventing the growth and multiplication of H. pylori bacteria in the mouth, as well as avoiding bad breath caused by dental calculus or oral inflammation. In addition, bad breath can be effectively relieved after the eradication of H. pylori. Generally, quadruple therapy is used, such as omeprazole, clarithromycin, amoxicillin, bismuth pectin and other drugs used in combination. The above medicines are for reference only and should be used in accordance with medical advice. When Helicobacter pylori infection occurs, it is recommended to seek prompt medical attention, follow the doctor’s instructions for further examination, and carry out targeted treatment or therapy with the doctor’s help.