Bad breath and breathing odor may be caused by H. pylori infection, a bacterium related to gastric ulcer and gastritis. H. pylori affects digestion, causing indigestion, and when a large amount of food stays in the gut, it becomes acidic and even putrid. Halitosis caused by H. pylori is manifested as breath odor, it is not like anaerobic bacteria, which can be eliminated with normal saliva secretion, nor can it be eliminated by brushing teeth or rinsing mouth, so to eliminate this bad breath, H. pylori must be eliminated. The clinical use of a triple combination of drugs is more effective. Although this bad breath, not out of the mouth, but oral hygiene is also very important, because poor oral hygiene, easy to cause other inflammatory diseases in the mouth, which is also the cause of bad breath, so maintain oral hygiene, you can prevent and control a variety of periodontal diseases, to eliminate bad breath.