• The Oral-B iO series Gentle Care replacement brushes combine powerful yet gentle micro-vibrations with our dentist-inspired round brush for a professional cleaning sensation every day. • Exclusively designed for Oral-B iO electric toothbrushes, the Gentle Care brushes help remove up to 100% more dental plaque than a conventional manual toothbrush, for clean and vibrant teeth. • The Gentle Care brush has up to 4,000 flexible bristles and an outer circle of pressure-cushioning bristles to precisely fit the curvature of the teeth and protect the gums. • Since dentists recommend changing your brush every 3 months for best results, Oral-B replacement brushes are equipped with color-changing bristles to indicate it's time to change the brush. • Get superior brushing power with the only replacement brushes exclusively designed and guaranteed for your Oral-B iO electric toothbrush.