Halitosis is mainly divided into physiological halitosis and pathological halitosis, and its solutions include careful brushing of teeth, use of mouthwash, etc., and active treatment of primary diseases to alleviate halitosis. 1. Physiological bad breath is mainly caused by eating foods containing irritating odors, such as green onions, garlic, leeks and so on. Or it is caused by poor oral hygiene due to long-term lack of attention to brushing. At this time you need to develop good brushing habits, can be carried out 2 to 3 times a day, you can also use some antibacterial mouthwash to gargle. 2. Pathological bad breath is mainly caused by some oral diseases or systemic diseases of bad breath symptoms, such as caries, gingivitis, periodontitis, chronic gastritis, gastroesophageal reflux, gastric cancer and so on. For example, patients with caries can apply filling surgery; patients with gingivitis and periodontitis can use scaling surgery to remove tartar and control plaque. 3. Patients with systemic diseases should be treated under the guidance of the doctor for the cause, and also pay attention to oral hygiene, use saline, 1%~3% hydrogen peroxide solution, 1%~4% sodium bicarbonate solution, 0.02% furacillin solution and other gargles for gargling to alleviate the symptoms of halitosis. It is recommended that patients first figure out the cause of bad breath, and then carry out targeted treatment.