There is no fastest way to get bad breath, you may need dental scaling, repair caries, treatment of gastrointestinal diseases and good daily oral care and pay attention to personal oral hygiene to improve, it is recommended to go to the hospital to check the cause of bad breath and treatment. 1. If there are dental calculus in the mouth for a long time attached may cause bad breath, you can go to the stomatology department regularly to clean the teeth, remove the dental calculus, and then appropriate use of anti-inflammatory drugs, commonly used cefaclor plus metronidazole tablets, cephalosporin allergies use erythromycin. 2. The presence of dental caries in the oral cavity may cause food embedded in the cavity, anaerobic bacterial infection at the same time will also oppress the gums bleeding pus caused by bad breath, this situation, you need to go to the stomatology department will be caries filling in a timely manner to repair the good. 3. Gastrointestinal dyspepsia should be corrected dietary habits, treatment of gastrointestinal diseases, the need for surgical treatment or the use of traditional Chinese medicine to regulate. 4. Usually, you should pay attention to brushing your teeth on time, at least twice a day, and try to eat less spicy and stimulating food, etc. You can use chewing gum or breath mints. Appropriate use of chewing gum or breath freshener. Foul breath, it is recommended to go to the hospital to exclude diseases such as dental caries or dental calculus and other causes, under the guidance of the doctor to take targeted treatment.