The main methods to eliminate bad breath are the following: first, usually brush your teeth, rinse your mouth carefully, and to go to the hospital for ultrasonic cleaning, through the scaling of teeth to remove the tartar around the teeth and between the teeth, plaque and other dirty things, to create a good oral hygiene environment, so as to play a fresh breath effect; second, you can eat clear heat to lower the fire of drugs, such as clear fire gardenia wheat tablets, Niuhuang Shangqing Pills, Andrographis tablets, etc., to lower the Third, in order to avoid halitosis caused by strong stomach fire, the diet should be light, easy to digest food, avoid greasy and sweet food, and each meal should not be too full, after the meal to carry out appropriate exercise; fourth, if the halitosis is caused by strong liver fire, you can take gentian diarrhea liver pill and Xiao Chai Hu Tang to lower liver fire.