Oral-B iO Ultimate Cleaning Toothbrush Heads for Sensational Mouth FeelingCombines mild micro vibrations with Oral B's recognizable round brush head for an unexpectedly pleasurable experience and lifelong healthy teeth and gums. Lessens the accumulation of plaque near the gums The high density dual length bristles provide an optimum level of cleaning by encircling and reaching deep between teeth. In line with Oral B iO Electric Toothbrush Handles compatibility