Hepatitis B is not usually transmitted through kissing, but transmission cannot be ruled out when both people have broken oral mucosa (less likely). Hepatitis B is an infectious disease caused by infection of the body with the hepatitis B virus. The main ways of transmission of hepatitis B virus include mother-to-child transmission, sexual contact transmission and blood transmission. Kissing does not belong to any of these transmission routes, so the probability of transmission through kissing is small. When living with a person with hepatitis B, you should be very careful not to share items such as toothbrushes and razors, which may be contaminated with the blood of the person with hepatitis B and thus cause transmission. If the oral mucosa is broken when kissing, the possibility of blood transmission cannot be ruled out, but the probability is small. It is generally believed that under normal circumstances kissing will not spread hepatitis B.