Indicator Bristle. Comfort Grip. The brand more dentist use themselves. At Oral-B we care for your oral health by developing innovative products that are trusted by dental professionals worldwide.Ergonomically designed handle for comfort and control. Blue indicator bristles fade halfway so you know when to replace your brush. Clinical research proves that a new toothbrush can remove up to 30% more plaque than one 3 months old. End-Rounded Bristles: Carefully polished end-rounded bristles are gentle on your teeth and gums.