The Oral-B iO Ultimate Cleaning brush head removes up to 100% more plaque than a traditional manual toothbrush and thus ensures the best cleaning from Oral-B. The revolutionary magnetic technology of the iO toothbrush delivers energy precisely to the bristles. The twisted bristles adapt perfectly to individual teeth, while the "bristle-in-bristle" bundles reach deep into the gaps between the teeth. iO brush heads are only compatible with Oral-B iO electric toothbrushes.