- Oral-B iO Gentle Care Black Replacement Brush Heads, designed for sensitive gums - Includes 3 original round brush heads exclusively compatible with Oral-B iO electric toothbrushes - Equipped with up to 4000 ultra-soft bristles for a deep and gentle clean - Outer cushioning ring that protects the gums and adapts to the shape of the teeth - Smart bristles that change color to indicate when it's time to replace the brush head - Removes up to 100% more plaque than conventional manual toothbrushes - Recommended replacement every 3 months to maintain maximum cleaning effectiveness - Inspired by professional tools for a superior daily clean feeling - Ideal for those seeking gum protection and brighter teeth