If there are teeth inside the mouth that are rotting, making bad breath present in the mouth, this is the time to make sure that the rotting teeth are treated. The first thing to do is to go to the hospital for an examination to see the degree of tooth rot. If it is just simple caries or pulpitis periapical inflammation, just dental treatment can be carried out, you can fill the caries. Pulpitis and periapical inflammation require root canal treatment, which removes decayed tooth tissue, and after applying sterile filling materials, the taste that occurs with tooth decay will disappear. However, if the decay is so severe that there is no way to retain the root, the decayed root needs to be extracted as soon as possible, and the bad breath will also disappear after the extraction. In addition, when there is bad breath, you can also use chlorhexidine mouthwash to rinse your mouth, which can effectively reduce the bacteria in the mouth and maintain oral hygiene.