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The Oral-B iO Series Gentle Care Replacement Brush Heads combine powerful but gentle micro-vibrations with our unique, dentist-inspired round brush head design for a professional clean feeling every day. Designed exclusively for Oral-B iO electric toothbrush handles, the Gentle Care brush heads help remove up to 100% more plaque than a regular, manual toothbrush, leaving teeth feeling clean and bright. The Gentle Care brush head combines 4000 soft bristles and a cushioning outer ring to precisely adapt to the curvature of teeth and protect gums. Since dentists recommend changing your toothbrush head every 3 months for best results, Oral-B replacement brush heads feature color-changing bristles that signal when it's time for a change. Enjoy superior cleaning power with the only refill brush heads designed exclusively for – and guaranteed to fit – your Oral-B iO electric toothbrush. Features HIGH BRISTLE DENSITY: Oral-B Gentle Care Replacement Brush Heads are densely packed with up to 4000 soft bristles for a gentle and perfect clean COLOR-CHANGING BRISTLES: The Oral-B replacement brush heads feature color-changing bristles to signal when to change the brush head to maximise your clean REPLACE EVERY 3 MONTHS: A worn-out brush head makes cleaning difficult, leaving bacterial plaque behind. For a superior clean, replace your brush head when the bristles fade to white EXCLUSIVE FOR ORAL-B iO HANDLES: Get superior cleaning power with the only brush head designed exclusively for – and guaranteed to fit – your Oral-B iO electric toothbrush TRUSTED BY DENTISTS: Oral-B is the #1 Dentist-Recommended Toothbrush Brand Worldwide.