If you have bad breath, you can consider applying the following medications. The first is for bad breath caused by pathogenic bacteria in the mouth, then you can consider the application of antibiotics, such as broad-spectrum can consider the application of amoxicillin or cephalosporin antibiotics, for periodontal anaerobic bacterial infections, with the application of nitro-mizole antibiotics, such as metronidazole, tinidazole, ornidazole, etc., these drugs can inhibit bacteria, thereby relieving bad breath. However, it must be noted that for this kind of bad breath, it is more important to remove the cause of bad breath, such as periodontitis or gingivitis caused by bad breath, the first step should be to remove the periodontal tartar and plaque, and then with the application of drugs to achieve better clinical results. At the same time, you can consider applying some gargling medications, such as compound chlorhexidine, cipay gum solution, etc. These medications can keep your breath relatively fresh. In addition to this situation, there are also systemic diseases caused by bad breath, for example, if the gastrointestinal tract gastric ulcer caused by bad breath, you can consider the symptomatic application of omeprazole enteric tablets to relieve gastric ulcers, so as to achieve the effect of treating bad breath, if it is caused by diabetic ketoacidosis bad breath, you can consider the application of hypoglycemic drugs, such as insulin, Bystolic drugs to control blood sugar, so as to relieve bad breath. Of course, this type of disease is still recommended to patients to professional gastroenterology or professional endocrinology for consultation and treatment.