Halitosis is a common clinical condition, mainly divided into true halitosis, pseudo halitosis and halitophobia, true halitosis is divided into physiological halitosis and pathological halitosis, while pathological halitosis is divided into orogenic halitosis and non-oral halitosis, so for halitosis, according to the factors causing the appropriate treatment, not through the food eaten to treat. First, physiological halitosis: generally short duration, often because of hunger, ate garlic or other irritating food, taking drugs, smoking, or sleep resulting in less saliva secretion, so that a large number of bacteria decomposition of food residues in the mouth and other reasons, this situation can be relieved by brushing your teeth in the morning and evening, rinse your mouth after meals and other ways to clean your mouth in a timely manner. Second, pathological halitosis: 1, orogenic halitosis: the main method is to reduce the number of bacteria and reduce the number of nutrients that can be used by bacteria, by cleaning the mouth, such as flossing, brushing, cleaning the tongue, but also by rinsing chlorhexidine, mouthwash with essential oils or oral triclosan, ciprochlor ammonium antibacterial drugs to inhibit the formation of plaque and relieve the symptoms of halitosis. In addition, you can also use oxidants, metal ions, sodium bicarbonate and dehydroascorbic acid under the guidance of a doctor to inhibit bad breath; 2, non-oral halitosis: If all the above measures have been implemented and bad breath still exists, patients need to go to the hospital in time to find the cause. Usually due to digestive system diseases, respiratory system diseases, metabolic diseases, etc. After clarifying the cause, the symptoms of bad breath are reduced by controlling the systemic diseases. For example, halitosis caused by H. pylori infection in the digestive tract can be treated by applying drugs for sterilization; if endocrine or other systemic diseases exist, the primary disease should be actively treated. In addition, patients with bad breath can also temporarily relieve the symptoms of bad breath by drinking lemon tea, drinking chrysanthemum tea, eating chewing gum, and having regular dental cleanings. Patients with pseudo-bad breath can be relieved by health education and guidance, while patients with halitophobia who still cannot be relieved are advised to consult a psychiatrist.