The extremely soft bristles of Oral-B Pro Sensitive Clean are gentle on the gums, while the general bristles treat plaque mercilessly. Oral-B removes up to 100% more plaque than manual toothbrushes and reduces gingivitis 100% more effectively. Original Oral-B toothbrush heads with new X-shaped bristles successfully clean places that round bristles cannot reach. The toothbrush head usage indicator changes the color of the bristles from green to yellow for 100% cleaning efficiency, indicating that it is time to replace them. Guaranteed to be used with all Oral-B rechargeable electric toothbrushes, with the exception of Pulsonic and iO toothbrushes.