The Oral-B Pro Precision Clean toothbrush head adapts perfectly to every tooth and removes up to 100% more plaque than a manual toothbrush. Original Oral-B brush heads have new X-shaped bristles that clean areas that traditional bristles cannot reach. The green indicator bristles turn yellow over time depending on individual use, indicating the optimal time to replace the brush head - for 100% cleaning efficiency. Guaranteed to fit all Oral-B rechargeable toothbrushes except Pulsonic and iO.