H. pylori infection can cause bad breath. There are some bacteria in the human body and mouth that can cause bad breath, among them is H. pylori. H. pylori is a very special bacteria, the general bacteria can not survive in the stomach, because the concentration of acid in the stomach is very high, so far only found H. pylori can survive in the stomach. H. pylori can destroy the gastric mucosa, the least will lead to indigestion, bad breath, H. pylori secretions will emit a very bad smell, the formation of serious bad breath, and H. pylori will also cause cancer. So suffering from H. pylori bad breath, must go to a regular hospital for treatment in a timely manner, through the triple or quadruple therapy to eliminate H. pylori, and then pay attention to oral hygiene, bad breath will be eliminated.