If there is bad breath inside the mouth, it can be treated from three aspects, due to different causes of bad breath, to take different treatment measures. The first aspect, the most common is the presence of bacteria in the mouth, such as suffering from gingivitis, periodontitis, this time the mouth in addition to bad breath, there are more obvious bleeding gums, serious will have loose teeth, periodontal overflow pus. You need to go to the hospital for periodontal systemic treatment, including supragingival scaling, subgingival scraping, root surface leveling, and possibly periodontal surgery. In the second aspect, there is a possibility of chronic tonsillitis in the throat, which requires tonsillectomy for complete healing. In the third aspect, bad breath can also occur with reflux esophagitis of the digestive system, which requires treatment of the digestive system disease and can be treated with some oral medications.