Oral-B Replacement Toothbrush Heads for iO Gentle Care Pack of 6 for LetterholeThe soft iO brush head for gentle brushing without compromising on cleaning Oral B iO Gentle Care features up to 4000 soft bristles and a shock absorbing outer ring to precisely adapt to the curvature of the teeth and protect the gums The iO technology combines Oral B iconic round heads with the delicate micro vibrations of the iO toothbrush for excellent cleaning performance of Oral B Oral B iO brush heads are designed exclusively for Oral B iO