Disappearing Red Dot / toothbrush

As we all know, toothbrush has 3 months shelf life, but we always forget the time of using for it. The longer we use it, the easier we get oral disease.
In order to remind the user time of using, we put the countdown mark on the toothbrush handle-”Disappearing Red Dot”. When using a new toothbrush, we firstly tear off the protective film on it, after this step three red dots start to disappear gradually: with each month disappearing one dot. In this way to remind us time of using and we should replace the toothbrush and make sure its cleanness.