Bad breath is generally caused by dental caries, periodontitis and dentures that have been installed for a long time and cannot be tightly fitted. The source of bad breath is the food residue decay in the mouth, as well as the odor from inflammatory pus and pus and blood. Treatment of this aspect of halitosis to first treat dental disease, dental caries must be thoroughly treated to solve the dental nerve inflammation, with suitable filling materials to fill the affected teeth; periodontitis can first go to do dental cleaning can quickly deodorize; installed for many years loose dentures do not fit can be removed and reinstalled, while paying extra attention to oral hygiene, with sterilization effect of mouthwash rinse, drink more green tea and mint tea, to eliminate inflammation The aromatic breath is very good.