The Philips Sonicare HX6056/88 replacement brush heads are designed specifically for adults who need a gentler approach to oral care due to sensitive teeth and gums. Each pack contains six black, oval-shaped heads featuring over 3,000 densely packed, extra-soft bristles that work with Sonicare Fluid Action technology to reach deep between teeth. By utilizing these specialized bristles, you can remove up to 10x more plaque than you would with a manual toothbrush, ensuring a thorough clean without irritating delicate tissues. These heads are compatible with most Philips Sonicare handles, though they will not fit the Philips One series.