Usually it is not contagious when a straw is used. However, when a child has a break in the mouth it can lead to infection. Hepatitis B is transmitted through blood, body fluids and mother-to-child transmission. 1. Blood Transmission: When normal people’s skin is broken and contacted with the blood of hepatitis B patients, it may cause infection. Such as surgery, tooth extraction, tattooing and other processes of skin breakage leads to blood transmission, leading to infection. 2. Body fluid transmission: when the saliva or secretion of hepatitis B patient enters into the body of normal people through the mucous membrane or tiny wound of the skin, it will cause hepatitis B virus infection, such as sharing toothbrush, straw when there is a breakage in the oral cavity, it is easy to cause infection. 3. Mother-to-child transmission: pregnant women with viral hepatitis B, the virus through the umbilical cord infection of the fetus, resulting in fetal infection. Daily activities such as hugging, shaking hands and playing usually do not transmit hepatitis B virus. It is recommended that after a period of time, you can go to the hospital to check the hepatitis B pentameter, and it is recommended that you receive the hepatitis B vaccine according to the national regulations.