Here are some tips for keeping your toothbrush in tip-top shape:
Don't share your toothbrush.
Rinse it thoroughly after each use to remove any remaining paste and debris.
Store your toothbrushes in an upright position after use and allow them to air dry. Storing a moist toothbrush in a closed container promotes microbial growth more so than leaving it exposed to the open air.
Toothbrushes should be replaced approximately every three months or more often if the bristles become matted or frayed.
To prevent cold and flu viruses from being passed between brushes, try to keep your toothbrush from touching others when it is stored.
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. Even if you haven't been sick, fungus and bacteria can develop in the bristles of your toothbrush - another reason to change your toothbrush regularly.