There are many reasons for secondary bad breath, the common ones are 1. Oral diseases: suffering from suppurative tonsillitis and sialadenitis, dental caries, gingivitis, periodontitis, oral mucositis and tooth decay, periodontal disease There are many reasons why people with other oral diseases are prone to secondary bad breath. The common ones are 1. Oral diseases: suffering from suppurative tonsillitis and sialadenitis, dental caries, gingivitis, periodontitis, oral mucositis and People with oral diseases such as tooth decay and periodontal disease are prone to breed bacteria in their mouths, especially anaerobic bacteria, which decompose to produce sulfide, which emits a rotten taste and produces bad breath. 2. Gastrointestinal diseases, such as peptic ulcer, chronic gastritis, functional dyspepsia, etc., may be accompanied by bad breath. Recently, we have also found that the incidence of halitosis in patients with Helicobacter pylori infection, which causes many gastric diseases, is significantly higher than that in uninfected patients, and the symptoms of halitosis are significantly reduced after eradication of Helicobacter pylori. The reason may be that Helicobacter pylori infection directly produces sulfide, which causes bad breath. 3. Diet to lose weight, or unable to eat due to illness, or the salivary gland function of the elderly is reduced, and women have endocrine disorders during menstruation, resulting in reduced saliva secretion, which is conducive to the growth of anaerobic bacteria, so bad breath occurs. 4. Bad breath in girls: Some women in puberty have insufficiency of ovaries and low levels of sex hormones, the resistance of oral tissues is reduced, and they are easily infected with bacteria, resulting in bad breath. 5. Drugs that can reduce saliva secretion, such as certain sedatives, hypotensive drugs, atropine drugs, diuretics, and traditional Chinese medicines with warming and tonic effects. 6. Patients with diabetic ketoacidosis, hepatic coma, and some respiratory diseases such as bronchitis, bronchiectasis, sinusitis, pharyngitis, tonsillitis, lung cysts, etc., may also cause bad breath. 7. Long-term constipation will cause bad breath, abdominal distension, loss of appetite, irritability and other autopoisoning symptoms because the harmful substances produced in the body cannot be excreted in time and are absorbed into the blood. 8. Dinner is too “heavy”, overeating or eating meat, the proportion of greasy food is too large or the amount of spicy and irritating seasoning is too large, the fragrance is too strong, the light is not enough, the time between dinner and sleep is too short, and the stomach is in the stomach when sleeping There is still too much food and so on. 9. Patients with oral ulcers caused by endocrine, stomach bacteria or viruses, etc., some patients will also have bad breath. 10. Excessive psychological pressure and frequent mental tension lead to the excited state of the body’s parasympathetic nerves, and the secretion of digestive glands, especially salivary glands, is reduced reflexively, resulting in dry mouth, which is conducive to the growth of anaerobic bacteria, resulting in bad breath. Some digestive diseases, such as Helicobacter pylori infection, may also cause anaerobic bacteria to be active, or directly produce sulfides, causing bad breath. Prevention and treatment measures – prevention and treatment of simple bad breath 1 Rinse your mouth after meals, brush your teeth before going to bed, pay attention to cleaning dentures, and develop good oral hygiene habits. 2. It is not advisable to have a full meal (especially dinner), do not eat snacks before going to bed, eat a light diet, and eat less spicy and other irritating foods. Drink less alcohol and quit smoking. Avoid eating cold, irritating, smelly (such as garlic, onion, leeks, stinky tofu, etc.) and indigestible, greasy (high-fat, high-protein) foods; chew slowly when eating; drink plenty of water, Eat more vegetables, fruits and beans; live a regular life and rest, keep a good mood; take part in more physical exercise. 3. Prevent constipation and keep the stool smooth. 4. In order to promote saliva secretion, middle-aged and elderly people can chew green olives and plums, often eat fruits, and drink Ophiopogon japonicus and licorice as tea. 5. Drinking a glass of warm salt water on an empty stomach every morning can regulate gastrointestinal function and help eliminate bad breath. 6 Red dates and black dates can eliminate short-term bad breath caused by onions and garlic, and chew 1-2 pieces after meals. In addition, drinking strong tea can relieve garlic odor.