Toothbrushes should be left out in the open. It is not difficult to clean your toothbrush. Rinse it after brushing with tap water and then remove any remaining toothpaste or debris. Store the brush standing upright to allow it to air dry. If you store near other tooth brushes, do your best to make sure they are separated to prevent contamination between them. Unless you are traveling, try not to store them in closed containers. A moist environment is more favorable to bacterial growth.