The main medications for bad breath include chlorhexidine solution, sodium fluoride rinse, and plant polypeptide mouthwash, etc. Because the above types of medications have a killing effect on a variety of harmful flora in the oral cavity, they can alleviate and improve the symptoms of bad breath. However, for bad breath symptoms, the specific cause needs to be diagnosed before radical treatment.　　Inflammatory diseases of the stomach are a common cause of bad breath, such as superficial gastritis, gastric ulcer, and Helicobacter pylori infection. Such patients need symptomatic treatment with antibiotics, H2 receptor antagonists, gastric wall mucosal protectors and other types of drugs such as metronidazole, ranitidine, and gastrodin. Oral diseases can also cause the symptoms of bad breath, such as gingivitis, tooth decay, stomatitis, etc. It is recommended to go to the hospital as soon as possible to receive a more detailed and comprehensive examination to confirm the specific cause of the disease before symptomatic treatment.