If you suddenly have bad breath, you should go to the hospital for scaling, and use the method of scaling to thoroughly remove food debris, tartar, tartar, plaque and plaque on the tooth surface, in the periodontal pockets and between the teeth, to create a good oral hygiene environment, and the phenomenon of bad breath will be greatly relieved. Sudden bad breath may also be caused by the body on fire, so drink more water, eat light, easy to digest food, eat more fresh vegetables and fruits. For the bad breath caused by fire, you can take the appropriate amount of drugs to remove heat, such as gentian diarrhea liver pill, clear fire gardenia oatmeal, oxalic acid pill, etc., you can also drink chrysanthemum tea, honeysuckle tea, bamboo leaf tea, etc., these teas have the function of removing fire, and have a certain effect on the treatment of halitosis. Sudden bad breath may also be mouth inflammation or mucous membrane of ulcers, if the teeth have periapical periodontitis, wisdom tooth pericoronitis, periodontitis, or mucous membrane large area of ulcers, also can cause bad breath, this situation should consult the doctor in time, symptomatic treatment.