The TriZone attachment brush provides particularly effective deep cleaning with its 3-zone technology. Its bristles swing sideways, reaching into the gaps between teeth, allowing you to clean your teeth like with a manual toothbrush, but with more power. The 3-bristle zones feature Power Tip bristles for the back molars, shorter bristles for the tooth surface, and longer, oscillating bristles that reach up to 2 times deeper into the gaps between teeth than a conventional manual toothbrush. Compatible with Oral-B Genius, Pro, Smart, and Vitality electric toothbrushes.