The replacement CrossAction head surrounds each tooth with its 16 degree angled bristles, while the 2D cleaning action oscillates and rotates to remove more plaque than a normal manual electric toothbrush phb . It includes a handy timer in the handle that helps you brush your teeth for the two minutes recommended by dentists. And best of all, it is from Oral-B, the brand most used by dentists around the world. Compatible with the following replacement heads: CrossAction, 3D White, Sensi Ultrathin, Sensitive Clean, Precision Clean, FlossAction, TriZone, Dual Clean, Power Tip and Ortho Care.