After each brushing, be sure to brush well to remove any remaining toothpaste in between.
Since moist environments are a very suitable place for bacteria to grow, try to keep the toothbrush dry at all times. It is recommended not to put the toothbrush cover on immediately after using it, because it will not allow the toothbrush to dry but rather keeps it moist, and thus this accelerates the growth of bacteria on the toothbrush.