Halitosis may be physiological or pathological, such as gingivitis, periodontitis, etc. Physiological reasons need to adjust the lifestyle, pathologically caused by the need for targeted treatment under the guidance of a doctor, such as drug therapy, surgical treatment. 1. Physiological: bad oral hygiene habits such as not brushing teeth diligently can lead to a large amount of food debris embedded in the teeth for a long time, thus triggering oral odor. By drinking more water and brushing twice a day with fluoride toothpaste to remove food debris and plaque, bad breath can be removed gradually. 2. Pathologic: (1) Some patients with gingivitis may feel localized itchiness, swelling, discomfort, bad breath and other symptoms, and there will be bleeding gums when brushing teeth. Plaque and tartar can be removed by scaling, irritants can be removed, and hydrogen peroxide can be used for rinsing. Patients with gingivitis with heavy inflammation can take oral antibiotics, such as cephalosporins. (2) Gums of periodontitis can show different degrees of chronic inflammation, and when the bacteria in the mouth will continue to grow, so it is easy to make the mouth odor. The basic treatment is to remove the plaque on the surface of the teeth through scaling, root surface scraping, etc., so as to maintain oral hygiene. This symptom alone is not enough to diagnose the disease, and it may be caused by other factors, such as nasopharyngeal diseases. When halitosis is obvious, if it is not obvious by adjusting the lifestyle, it is necessary to go to the hospital in time to clarify the cause of the disease and follow the doctor’s instructions to standardize the treatment.