To cure bad breath guy bounced around the departments spent tens of thousands of yuan effect is not good, respiratory medicine, gastroenterology, otorhinolaryngology, traditional Chinese medicine …… In order to cure bad breath, Zhang ran around the hospital departments, do a variety of tests and treatment cost tens of thousands of yuan, but the effect is not good. Yesterday, Zhang took a try to the Tongji Hospital stomatology department. The doctor test found that the concentration of sulfide in Zhang’s mouth reached a serious level. After the doctor gave Zhang clean teeth, measured again, the concentration of sulfide back to normal levels, the original Zhang suffered from halitogenic halitosis. Orogenic halitosis, also known as pathological halitosis, is 90% from the oral cavity. Microorganisms in the oral cavity breed and decompose, producing volatile sulfides and other volatile organic compounds, etc. The higher the concentration of sulfides, the heavier the odor. The causes of pathological bad breath include periodontal disease, thick tongue, food embedding, caries (especially adjacent surface caries), etc., among which the most important is periodontal disease and thick tongue. Most of the bad breath can be relieved if patients treat the symptoms according to the local causes of oral cavity and pay attention to oral hygiene. People usually think that gastrointestinal diseases are the important cause of bad breath. In fact, bad breath has little to do with gastrointestinal diseases unless it is more serious, so having bad breath should start with an examination in dentistry.