Clean your kidneys:
After brushing, thoroughly rinse the toothbrush with tap water for at least twenty seconds to remove any toothpaste and debris. Store the toothbrush in an upright position and allow it to dry. Putting a plastic cover on it and throwing it into a drawer creates a moist environment that promotes the growth of most germs. If you are especially worried about bacteria on your brush, you can buy an ultraviolet sanitizer.