Toothbrushes are a great breeding ground for germs, fungus and bacteria, so the best thing you can do to keep your toothbrush and yourself healthy is to make sure you let it dry out between uses. After using your toothbrush, shake it vigorously under tap water and store it in an upright position so that it can air out.It is also important to change toothbrushes after you've had a cold, the flu, a mouth infection or a sore throat. That's because germs can hide in toothbrush bristles and lead to reinfection. To prevent cold and flu viruses from being passed between brushes, try to keep your toothbrush from touching others when it is stored. A standard toothbrush holder with separate slots for brushes to hang upright is a worthwhile investment in your family's health!