Dr. Sievert recommends at least every three months. If you’re using and electronic toothbrush, make sure to check the recommendation of the type of toothbrush because you may not have to change the head of the brush often. If a patient has gum disease Dr. Sievert recommends that you change your brush more often then every three months. Also, after brushing it’s very important to wash and rinse your brush out with hot water. This will kill germs and bacteria and keep your tooth brush clean.