There is a possibility of transmitting the hepatitis B virus by using a toothbrush that has been used by a patient with hepatitis B. Toothbrushes are personal items that come into contact with mucous membranes and should not be shared. Hepatitis B patients carry Hepatitis B virus (HBV) in their bodies, which is mainly transmitted through blood and blood products, mother-to-child, broken skin and mucous membranes, and sexual contact. When sharing toothbrushes, there may be the possibility of transmission of HBV through body fluids and blood, so sharing toothbrushes with hepatitis B patients may be infected with HBV. The toothbrush not only touches the oral mucosa of hepatitis B patient, but also touches the blood of hepatitis B patient when the patient’s gums bleed, so sharing the toothbrush with the patient is very likely to cause hepatitis B virus transmission. People living with hepatitis B patients should pay special attention to not sharing personal items such as toothbrushes and razors.