Deeper clean, healthier gums. Our contour following AdaptiveClean brush head enables more surface contact and easily absorb any excess brushing pressure. Achieve a thorough deep cleaning experience, without the possibility of over-brushing and aggravating sensitive gums. Model number: hx9044/27. Pack of 4. The flexible sides and bristles of the brush head absorb any excessive pressure you might apply and can remove up to 10x more plaque from hard-to-reach areas than a manual toothbrush. Compatible with 2 series plaque control, 3 series gum health, diamondclean, easyclean, flexcare, flexcare platinum, flexcare+, for kids, healthywhite.