Hepatitis B surface antibodies are protective antibodies that can effectively prevent infection with the hepatitis B virus. How long it takes for hepatitis B antibodies to disappear depends on the value of the antibodies and whether there is close contact with hepatitis B patients. The antibodies can gradually deplete and the value will become lower and lower and finally disappear completely, so the antibodies need to be monitored regularly. In normal people, antibodies are usually present for more than 10 years after the hepatitis B vaccine is administered. For people at high risk, it is important to monitor the hepatitis B surface antibodies and if they disappear, you will need to get three more doses of the hepatitis B vaccine. If antibody values are low, a booster shot of the hepatitis B vaccine is required. By generating antibodies, the chances of contracting the hepatitis B virus can be greatly reduced.