The Oral-B iO gentle cleaning brush heads combine powerful but gentle micro-vibrations with unique, dentist-inspired round brush heads for a professional cleaning experience every day. Developed exclusively for Oral-B iO electric toothbrushes, the gentle cleaning brush heads help to remove up to 100% more plaque than a conventional manual toothbrush, leaving teeth clean and bright. The gentle cleaning brush head has 4000 soft bristles and a cushioning outer ring to mould precisely to the curvature of the teeth and protect the gums. As dentists recommend changing the brush head every 3 months for results, Oral-B attachable brushes have colour-changing bristles that signal when it's time for a change.