10 things you don’t know can cause bad breath.1. Drinking large amounts of alcohol can dry out your mouth and easily breed bacteria that cause bad breath, in addition to caffeinated beverages, spicy foods and cigarettes can also. 2. Bacteria on the tongue tongue is the main cause of bad breath, clean your teeth with a toothbrush or floss and rinse your mouth aggressively and effectively can effectively reduce bad breath.3. Low-carbohydrate diet When reducing When carbohydrates are reduced and protein is increased, the body begins to burn fat for energy, a process that produces compounds called ketones, which can cause bad breath. In this case, better dental hygiene will not solve the problem, and the best option is to cover it up with sugar-free gum.4, colds and flu and respiratory infections such as bronchitis may also bad breath, because the bacteria that cause the odor multiply.5, stomach Helicobacter pylori A study has shown that an ulcer-causing Helicobacter pylori can also trigger bad breath, and dealing with the bacteria may eliminate the odor.6, certain drug treatments including More than 400 prescription and over-the-counter medications, including antidepressants and anti-allergy medications, can inhibit the flow of saliva, which is not conducive to washing away food and bacteria and can easily induce bad breath. it is recommended that you stay hydrated and chew sugar-free gum to keep your mouth moist, and special mouthwashes can also help. 7, tonsillitis after tonsillitis produces small white spots on its surface – consisting of hardened bacteria, food particles, dead cells and mucus. It may induce odor, sometimes you can gargle with salt water to speed up the removal. 8, dried fruit it is high in sugar, causing odor bacteria like to feed on such things, and dried fruit is very sticky, may stick between the teeth, be sure to floss or brush your teeth after eating. 9, gastroesophageal reflux this is a common digestive system disease, bad breath may come from some undigested food, or stomach acid stimulation of the nasopharynx and throat. .