Halitosis needs to be improved according to the specific causes, such as physiological factors, oral diseases, reflux factors, etc. After clear diagnosis, general treatment and medication should be chosen. 1. Physiological factors: Eating too much odorous food can lead to bad breath, such as garlic, onions, etc., are physiological phenomena, usually after avoiding such food can be gradually relieved. Secondly, if you have bad breath after waking up in the morning, it is a normal phenomenon, usually after brushing your teeth will disappear on its own. 2. Oral diseases: gingivitis, periodontitis, dental caries and other diseases, due to oral lesions produce bacteria, can also lead to bad breath. Treatment can be in the periodontal sequence of treatment or filling cavities or choose to compound chlorhexidine gargle to improve the symptoms, and at the same time with the anti-inflammatory drugs, such as ciclosporin, minocycline and so on. 3. Reflux factors: gastroesophageal reflux can also lead to the phenomenon of bad breath, the need to use drugs to protect the gastric mucosa, inhibit gastric acid, such as aluminum sulfate, omeprazole and so on. There are many reasons for bad breath, after the symptoms, it is recommended to go to the hospital in a timely manner to improve the examination, after a clear diagnosis to give standardized treatment, not to ignore the symptoms, to take it lightly. The use of drugs should be under the guidance of a physician.