Honestly, how long do you use your toothbrush attachment before replacing it with a new one? Chances are your answer to this question is: too long. But how come? While you're brushing, you probably think that your attachment needs to be replaced. But as soon as you turn off the brush, you forget this thought too. What do you do about this? Get a toothbrush with a Refill subscription. Why? You can read that here.