The Oral-B pro sensitive Clean is extremely soft bristles are gentle to the gums, and its general bristles are ruthlessly treating the plaque. It removes up to 100%more plaque than Oral-B manual toothbrushes and reduces gum inflammation more efficiently. The original Oral-B toothbrushes with the new X-shaped bristles also successfully cleanse places that are not achieved by round bristles. The toothbrush milk is used to change the color of the bristles from green to yellow for 100%cleaning efficiency, indicating that the time has come. It is guaranteed to be used with all Oral-B electric toothbrushes, except for Pulsonic and IO toothbrushes.