Oral-B CrossAction Brush Heads The Oral-B CrossAction toothbrush head features a professionally inspired round-head design, that cleans deeply and effectively - tooth-by-tooth. It features CrissCross bristles that are set at a 16 degree angle, to effectively clean along the gumline and reach deep between teeth to lift and power away up to 100% more plaque for a superior clean vs. a regular manual toothbrush. Indicator bristles fade as a sign to replace your toothbrush head for a better clean (about every 3 months). Dentists recommend replacing your toothbrush head about every 3-4 months, or when bristles are faded and worn. Compatible with the entire lineup of Oral-B rechargeable electric toothbrush handles, except for Oral-B sonic toothbrushes Oral-B, the #1 brand used by dentists worldwide.