The Oral-B Indicator Toothbrush has blue bristles that fade halfway to white, letting you know when it's time to replace your brush. And its bristles are curved to comfortably clean between teeth and along the gum line. The Oral-B Indicator Toothbrush is Accepted by the American Dental Association. Oral-B is the #1 recommended toothbrush brand by dentists worldwide. A new toothbrush can remove up to 30% more plaque than one three-month old.