- The round bristles on these Oral-B toothbrush heads remove up to 100% more plaque than a manual brush- Thanks to the precisely angled bristles, you can clean those hard-to-reach places in your mouth without missing a spot- The colour changing bristles let you know when it's time to swap the head for a new one- They're compatible with Oral-B iO electric toothbrush handles for the best oral care