1, often do not eat breakfast do not eat breakfast will cause obstacles to prevent bad breath saliva production, resulting in damage to oral health. 2, chewing too few chewing is the first process of food digestion, eating slow, chewing a lot of food can secrete a lot of saliva, and saliva can effectively control the reproduction of germs, to prevent the production of bad breath. Chewing less, swallowing directly is very easy to lead to bad breath. 3, tongue cleaning problems the more the number of tongue moss, the more likely to cause bad breath. So when you brush your teeth, you should also pay more attention to the cleaning of the tongue. 4, the wrong way to brush teeth toothpaste residue is not only the main culprit of dental caries, periodontal disease, but also prone to cause bad breath, so usually brush your teeth carefully and spend as much time as possible. 5, the existence of internal organs disease once people suffer from visceral diseases, the body of the abnormal fermentation of the odor through the blood vessels and lungs will be discharged out of the body, which will also lead to the production of bad breath. This will also lead to the production of bad breath. That is to say that bad breath is also an effective way to test the body of internal diseases. 6, did not brush your teeth before going to bed because the harmful bacteria in the mouth when you sleep in reproduction and growth, and the mouth is generally closed, halitosis is the bacteria in the airtight environment to grow and fermentation of the flavor. So you must brush your teeth before going to bed, and you can use it together with mouthwash if you have the conditions, the effect will be very obvious.7, bad intestinal and gastrointestinal function may be that your intestinal and gastrointestinal function is not good, the gas produced in the process of digestion through the esophagus back to the oral cavity.8, the decline in saliva secretion due to the decline in salivary secretion at night, the acidity in the oral cavity is reduced, so that the anaerobic bacteria decomposition of sulfur-containing proteins become abnormally active, and so the fecal reefs produce sulfide to more than the Other time periods more, so, the morning up the most serious bad breath. Fecal reef refers to the combination of food debris and intestinal bacteria, which slowly form a rock-hard reef-like substance over time, which is firmly attached to the intestinal wall and is the main cause of bad breath. And fecal reefs accumulate in the body for a long time, easy to produce hundreds of toxins. These toxins through the blood circulation, spreading the body organs, will lead to tissue cell lesions, triggering more than 370 diseases. Therefore, the problem of fecal reefs should not be underestimated.