• Oral-B iO Ultimate replacement heads designed for daily professional cleaning. • They combine powerful and gentle micro-vibrations with the exclusive Oral-B round head. • Remove up to 100% more bacterial plaque than a traditional manual toothbrush. • Bristles angled at 16 degrees for deep cleaning in hard-to-reach areas. • Bristles change color to indicate when it is the optimal time for replacement. • Designed and guaranteed to fit exclusively with Oral-B iO electric toothbrushes.