The Sonicare HX9052/95 is the premium gum care brush head which gives you healthier gums for a healthier smile. It is designed to work with all click-on sonicare models. These replacement brush heads have flexing sides that contour to your teeth and gums for 2x more surface contact to effortlessly remove your hard-to-reach plaque. Smart brush head replacement technology tracks how often and how hard you brush and will notify you when it is time to replace your brush head.