Eating fish with a patient with hepatitis B and getting infected from a fish splinter that breaks your mouth is not very likely, but it does not mean that 100% of the time you will not get infected. Hepatitis B virus is transmitted vertically from mother to child, through blood and body fluids, and through sexual contact. If both the patient and the co-eater have a break in their mouths when eating fish together, there is some possibility of transmission, but the probability is small. If both mouths are not broken, the chance of transmission will be greatly reduced. Daily contact with hepatitis B patients generally does not cause transmission, but be careful not to share toothbrushes, razors and other personal items. Under normal circumstances, when the body has been vaccinated against hepatitis B, protective antibodies against the hepatitis B virus will be produced, which can prevent infection to a large extent. If you eat fish with a hepatitis B patient and the fish splinter cuts your mouth and bleeds, it is recommended that you rinse your mouth in time and rinse the wound, and after rinsing, you can disinfect it with iodine povidone.