Oral-Bs improved 3D White toothbrush heads are developed with CleanMaximiser technology that turns green bristles yellow for optimal brush head performance and the best clean. The unique bristles brush away plaque for a more advanced clean than with a regular manual toothbrush. Compatible with all Oral-B handles except Pulsonic and iO. Oral-B 3D White Clean Maximiser Replacement Toothbrush Head, Pack of 8