When eating with a person with hepatitis B, it is generally not contagious. However, the mouth of hepatitis B patients with bleeding saliva also contains virus, then if the virus comes into contact with the wounds of susceptible people may be infectious, only contact with the gastrointestinal tract or oral mucosa is unlikely to be infectious. If there are ulcers in the digestive tract or bleeding gums or mouth ulcers, there is a certain possibility of infection if the virus comes into contact with saliva, but the possibility of infection is relatively small. If you want to not be infected at all, you can get the hepatitis B vaccine at this time. If you can determine that your hepatitis B surface antibody is positive, it means that you have gained immunity to the hepatitis B virus after the vaccination, so it is not possible to get infected with hepatitis B when you eat together, which is a more reassuring practice.