Halitosis refers to the unpleasant odor emitted from the mouth when speaking and breathing, also known as bad breath, usually caused by lack of hygiene, bad habits or disease factors, can be removed by diligent brushing, diet adjustment, drinking more water, quit smoking and alcohol: 1, diligent brushing: diet logistics brushing can avoid food residues embedded in the teeth, by oral bacteria fermentation, oral odor, there is a certain fresh breath Role; 2, diet regulation: reduce the intake of garlic, leeks and other foods with irritating odor, can relieve the temporary bad breath caused by such foods; 3, drink more water: oral dryness may lead to oral odor, drink more water, keep the mouth moist, can relieve the symptoms of bad breath; 4, quit smoking and alcohol: long-term smoking, drinking alcohol is easy in the mouth residual odor, usually should quit smoking and alcohol; 5, drink lemon water. Lemon has an aromatic odor, can quench thirst, appropriate drinking lemon water can moisten the mouth, fresh breath; 6, drink tea: tea aromatic, can refresh the breath, relieve mild inflammation of the mouth and throat caused by fire, thus relieving the symptoms of bad breath; 7, chewing gum: chewing gum can refresh the breath, clean the mouth, relieve bad breath symptoms, but not recommended long-term chewing gum, long-term chewing may lead to Oral flora ecological balance is damaged. If the above small remedies to remove bad breath is not obvious, it is recommended to go to the hospital to carry out relevant checks to determine whether the disease causes bad breath. For example, oral diseases such as periodontitis and dental caries may cause bad breath due to bacterial reproduction or fermentation of food residues in the mouth; inflammatory diseases such as rhinitis and tonsillitis may cause bad breath due to purulent secretions; patients with severe diabetes may have a rotten apple taste in the mouth and need to alleviate the symptoms of bad breath through allopathic treatment.