There is no authoritative literature on the best way to get rid of bad breath. Bad breath may be caused by periodontitis, caries and other diseases, the common treatment methods are periodontal treatment and filling treatment, as follows. 1. Periodontitis: Gram-negative periodontitis-causing bacteria have the ability to produce odor, periodontal treatment can be used, including scaling, scraping and root planing, periodontal surgery, etc. to control periodontal inflammation, so as to improve the oral odor. 2. Caries: Bacterial accumulation and food residues can produce odor, filling treatment can be used to remove decayed carious tissue, prepare the tooth into a cavity suitable for filling, and then use composite resin filling to restore the normal shape and function of the tooth, and the symptoms of oral odor can be relieved. There may be other causes of oral odor, so it is recommended to go to the hospital in time to receive professional treatment as soon as possible.