The Oral-B Pro Precision Clean toothbrush head fits every tooth perfectly and removes up to 100% more plaque than a manual toothbrush. Original Oral-B toothbrush heads have been developed with new X-shaped bristles, which now clean even 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 toothbrush head - for 100% cleaning power. Optimally fits all Oral-B rechargeable toothbrushes, except the Pulsonic and iO models.