There is no such thing as “the best”, bad breath should be based on the cause of the symptomatic treatment method, if it is a normal physiological phenomenon, just change the habits that lead to bad breath can be, if it is periodontitis, periodontal abscess and other diseases caused by drugs to get rid of bad breath. 1. physiological phenomenon: for example, always do not brush your teeth and other bad oral hygiene habits, will make bacteria, oral mucosa shed epithelium and food debris, etc. stay in the oral cavity, the formation of tongue moss, the thicker the tongue moss, the more conducive to the production of volatile sulfur compounds, resulting in halitosis, which can be changed by changing the bad oral hygiene habits to get rid of halitosis. 2. Pathological phenomena (1) periodontitis: periodontitis is a chronic inflammation caused by bacteria in plaque invading the periodontal tissues, due to the bacteria will produce volatile sulfur compounds, so the patient will have symptoms of bad breath, the patient can take metronidazole, tinidazole and other drugs to treat bad breath. (2) periodontal abscess: periodontal abscess is a common concomitant symptom of periodontitis that develops to the advanced stage, mostly due to Staphylococcus aureus combined with periodontal pathogenic bacterial infections, which leads to the symptom of halitosis, and the patient can be treated for halitosis with rinsing medicines such as clorhexidine solution and antibacterial medicines such as metronidazole. It is recommended that when patients have symptoms of bad breath, they should go to the hospital to clarify the cause of the disease and be treated under the guidance of the doctor.