There is no one-size-fits-all method for removing bad breath, and it is necessary to first identify the cause of the disease, and then individualize the treatment according to the cause of the disease. Such as physiological bad breath can be relieved by improving lifestyle, pathological bad breath need to treat the disease. 1. Physiological bad breath. Mainly related to not pay attention to oral hygiene, smoking and drinking and other bad habits, love to eat onion, ginger, garlic and other stimulating smell of food, for this group of people, through the regular brushing and rinsing, regular cleaning, improve lifestyle habits, quit smoking and limiting alcohol and other general treatments, you can improve the oral environment so as to freshen up the breath. 2. Pathological bad breath (1) Bad breath caused by oral diseases. Such as periodontal disease, gingivitis, pericoronitis, poor restorations, oral cancerous lesions, etc. For this type of bad breath caused by such conditions, you need to first treat the primary disease. Including the use of antibiotic drugs, such as metronidazole to fight pathogenic bacteria, reduce inflammation and thus treat the disease; surgical treatment of periodontal disease, oral cancerous lesions, replacement of bad restorations. (2) Bad breath caused by respiratory diseases. Such as tonsillitis, chronic maxillary sinusitis, bronchitis, pneumonia, nasopharyngeal abscess and other diseases, you can choose the appropriate drugs under the guidance of the doctor, surgery and other treatments for the primary disease, so as to improve bad breath. (3) Bad breath caused by the digestive system. Such as peptic ulcer, chronic gastritis, pyloric obstruction and other diseases, you can choose omeprazole and other treatment of disease; or surgical treatment. The above drugs need to be used under the guidance of a doctor.