The Oral-B iO Ultimate Cleaning attachment brush reliably removes plaque and provides you with thorough tooth cleaning. The iO toothbrush's magnetic technology delivers energy precisely to the bristle tips for optimal brushing performance. The brush head has twisted-in bristles that adapt to each tooth, and the "bristle-in-bristle" bundles reach deep into the interdental spaces. The iO brushes are only compatible with Oral-B iO microvibrating toothbrushes.