Anything that has germs on it and makes contact with your eyes, nose, or mouth allows those germs to enter the body. Your toothbrush is something you put in your mouth every day, or at least it should be. It is important to keep it clean to avoid exposing your mouth and body to unwanted germs.
Rinsing, Drying, And Storing
After brushing your teeth, it is not enough to just tap the brush against the sink to remove excess water.