Bad mouth and halitosis may be physiological or pathologic causes, such as periodontal disease, nasopharyngeal cavity inflammation, etc. According to different causes, conservative treatment, periodontal treatment, treatment of the original disease and other measures can be taken to quickly eliminate bad breath and halitosis. 1. Physiological bad breath, halitosis: generally due to sleep at night is shut up, just get up in the morning after the oral cavity will be found to have a peculiar smell; or due to eat raw garlic and other stimulating food and bad breath. At this time there is no need for special treatment, only serious brushing, gargling, bad breath, halitosis can generally disappear. 2. Periodontal disease: If the patient has serious periodontal disease, the gums are red and swollen, the periodontal pockets are deeper, and the gums are red and swollen and pus is overflowing, which will be manifested as halitosis and bad breath. At this time, periodontal treatment can be carried out, including gingival cleaning, subgingival scraping, root planing, etc., can quickly eliminate bad breath, halitosis. 3. Nasopharyngeal inflammation: when inflammation occurs in the nasopharynx, there is often inflammatory secretions, along the nasopharyngeal channel into the oral cavity, so that the oral cavity, bad breath, halitosis, at this time, should be actively treating the primary pathology, the local oral cavity to give gargling, brushing, most of the bad breath can eliminate bad breath halitosis. People with bad breath, halitosis may have other reasons, should be timely consultation, improve the examination, clear cause and diagnosis, standardized treatment under the guidance of a professional physician.