smart, it reminds you when it"s time for a new one. Did you know that a new toothbrush can remove up to 30% more plaque than a three-month-old toothbrush? The blue indicator bristles on the Oral-B Indicator fade to white when it"s time to replace your brush, and its ergonomically designed handle offers exceptional comfort and control.; Lets you know when to replace your brush; Provides comfort and control; Is gentle on teeth and gums; Fits in most toothbrush holders