Oral-B iO Series Gentle Care Toothbrush Refill Replacement Heads White, 4 Pack The Oral-B iO Gentle Care toothbrush head is specially designed for gentle and effective cleaning of sensitive areas and gums. Features: The softest iO brush head for a gentle brushing without compromising on cleaning Oral-B iO Gentle Care features up to 4000 soft bristles and a cushioning outer ring to precisely adapt to the curvature of teeth and protect gums The iO Technology combines Oral-B's iconic round brush heads with the gentle micro-vibrations of the iO toothbrush for Oral-B's best cleaning performance Oral-B iO brush heads are exclusively designed to fit Oral-B iO toothbrushes Dentists recommend changing the brush head every 3 months to keep an optimal cleaning efficacy Oral-B is the #1 brand most used by dentists worldwide with clinically proven results Box Contains: Oral-B iO Series Gentle Care Toothbrush Heads White, 4 Heads