Mouth odor, that is, oral odor, may be periodontitis, tonsillitis, gastric diseases and other diseases, can take amoxicillin and other antibiotics as an adjunctive therapy, combined with the appropriate periodontal treatment or surgical treatment, as follows 1. Periodontitis: Gram-negative periodontal pathogenic bacteria in deep periodontal pockets, such as Porphyromonas gingivalis and Porphyromonas intermedia, have the ability to produce odor, which is the source of odor. Amoxicillin can be taken to relieve periodontal inflammation, combined with perfect periodontal treatment, including supragingival cleaning, subgingival scraping. 2. Tonsillitis, purulent sinusitis, etc.: Chronic or purulent tonsillitis, the deep sockets can retain a large number of bacteria and food residues, or the formation of tonsil stones, which can produce a bad smell. Purulent sinusitis can also lead to bad taste in the mouth. Treatment of tonsillitis and purulent sinusitis involves taking sensitive antibiotics such as amoxicillin to control the infection, depending on the type of causative organism. There may be other causes of bad breath, so it is recommended to go to the hospital in a timely manner to clarify the cause of the disease and then carry out targeted treatment. All of the above medications should be used under a doctor’s supervision.