Currently there is no special drug for the treatment of bad breath, bad breath need to identify the cause of the drug, may be physiological, may be pathological; physiological causes generally do not need to use drugs, pathologically caused by the need for targeted treatment under the guidance of a doctor, such as drug therapy, surgical treatment. 1. physiological: due to leeks, stinky tofu and other stimulating foods, containing sulfide components, after consumption of odor can be retained in the oral cavity caused by bad breath, generally no medication is needed to treat, can subside with time on their own. 2. Pathologic: (1) stomatogenic bad breath, mainly caused by gingivitis, periodontitis, etc., in the dental acute inflammation period, local medication can choose minocycline gel, chlorhexidine acetate solution, etc., also oral metronidazole, amoxicillin, etc., and periodontal treatment is also needed to remove bad breath. (2) If gastritis or gastric, duodenal ulcer caused by indigestion caused by bad breath, the first can be used to inhibit acid drugs, such as rabeprazole, lansoprazole, and so on, plus gastric mucous membrane protective agents, such as Rebapatide, and so on. This symptom alone is not enough to determine the disease, do not rule out that it is caused by other factors. It is recommended that if physiological causes are ruled out, one should consult a doctor in time, ask the doctor to clarify the cause of the disease, and give targeted treatment. Drugs should be used under medical advice.