Hepatitis B is not necessarily the cause of bad breath, which can be caused by oral inflammation, gastrointestinal problems, Helicobacter pylori infection, etc., and can be treated with anti-infective therapy. If you are suffering from hepatitis B, you should consult a doctor in time to have the hepatitis B two halves and liver function tests, and carry out the necessary antiviral and hepatoprotective treatments according to the results of the tests. If there is bad breath, you can check whether there are oral problems, such as gingivitis, periodontitis, oral mucositis and dental caries, etc., you can treat the related oral inflammation, such as the use of antibiotics such as metronidazole; if it is a gastrointestinal problem, such as anaerobic infections, you can use ornidazole and other drugs; if it is a pylori bacterial infection, you can use omeprazole and other drugs. If hepatitis B and the symptoms of bad breath, you should promptly consult a doctor for examination and treatment of the cause of the disease, and the relevant drugs should be used under the guidance of a doctor.