If there is a bad breath problem to solve, from the following three points to consider: First, 80% of bad breath is caused by poor oral hygiene, such as the presence of oral calculus, gingivitis, periodontitis or the presence of decayed teeth, this time to solve bad breath need to remove calculus, treatment of gingivitis, periodontitis, repair of decayed teeth, and use some mouthwash, such as chlorhexidine mouthwash. Remove the bacteria in the mouth, so that oral hygiene to a good state, bad breath will disappear. Secondly, if bad breath is caused by chronic crypt tonsillitis, tonsillectomy can be performed so that bad breath will not occur. The third point is that if the bad breath is caused by reflux esophagitis, medication is needed to cure the esophagitis and gastritis and bad breath will not occur either.