Oral-B Precision Clean 10 Replacement Brush Heads are designed to give you a better clean by reaching deep between teeth and along the gumline. The bristles fade over time to remind you when it’s time to replace the head. Oral-B Precision Clean 10 Replacement Brush Heads are easy to attach and work with most Oral-B electric toothbrushes, except the iO series. They help keep your mouth feeling fresh and your smile healthy every day.