There are many causes of bad breath, the most common is caused by oral diseases and digestive system diseases, to find out the specific cause, the right treatment, in order to be effective. The most common oral causes of halitosis are caries and periodontitis. Due to the presence of a large number of bacteria in the mouth of patients with caries and periodontitis, this will make the mouth produce bad odor. The caries and periodontitis are produced by the bacteria in the mouth, these bacteria are harmful bacteria, after treating the caries and periodontitis, the oral odor will disappear slowly. You should keep good oral hygiene, apply mouthwash to maintain the oral flora environment, go to the hospital regularly to check the oral cavity, once the problem is found, you should deal with it in time. When a person’s tongue is gathered full of food debris, bacteria and dead cells, these things will cause bad breath, smoking, dry mouth, poor oral hygiene these conditions provide space for bacteria to live, which will cause bad breath. If the bad breath is mainly caused by a thick tongue, it should have some effect. Although the use of scraping the tongue to treat bad breath does not work, but the overall practice of good hygiene habits are equally important, remember to brush your tongue at least twice a day, so that the oral hygiene is clean, no space for bacteria to survive, this time the mouth inside the bad breath will be much less.