The hepatitis B virus is usually not transmitted when eating out, because it is mainly present in the patient’s bloodstream, and although saliva also contains a small amount of hepatitis B virus, the amount is very small compared to that in the bloodstream. The hepatitis B virus can only be transmitted through contact with the mucous membranes of the digestive tract during meals, which is generally not possible. Only when the mucous membrane of the digestive tract is broken, that is, when there is a mouth ulcer or a peptic ulcer or bleeding gums, can it be transmitted, but this situation is relatively rare. Another reason is that most people have been vaccinated against hepatitis B and have gained immunity to the virus, so it is impossible to get infected with hepatitis B by eating in this case. So, to be 100% sure that you will not be infected with hepatitis B, you need to get the hepatitis B vaccine.