I keep a small spray bottle of Listerine (the gold-colored) in the bathroom. After I have finished rinsing my toothbrush, I give it a few sprays with the Listerine to kill any germs remaining on the toothbrush.
By ilovesophie from MT
To keep toothbrushes clean and deodorized, fill a class with one part hydrogen peroxide and one part water (1/2 and 1/2). Make sure there is enough to cover all the bristles, and leave in there when not using.
A friend of mine puts her toothbrush in the dishwasher about twice a month to clean it, top rack only. Also soak it in about a tsp. of peroxide and rinse. Vinegar also will work as to soak overnight; be sure to rinse.
I now keep a small jar in my bathroom on the sink filled with hydrogen peroxide. When I finish brushing my teeth, I place my toothbrush into the jar.
Do yourself a favor and sterilize your toothbrushes in the dishwasher at least once a month.
After you have a cold or flu, wash your toothbrush with Listerine. I wash mine all the time in Listerine and even brush my teeth with the fluoride rinse and also the mouthwash.
We all know that we should change our toothbrush at least every 3 months because they become worn out and harbor bacteria in the bristles, but I could never remember to do it.
Sterilize your toothbrushes by soaking in some bleach water to sanitize on a regular basis.