Philips Sonicare HX9014 / 10 spare heads 4 pcsThe Philips Sonicare InterCare compact brushheads need to be replaced at prescribed intervals, both to maintain full functionality and for hygienic reasons. Ideally, replace the warhead every three months. You will also be reminded of the need to replace the special blue fibers , which turn white when overly worn. This pack contains four Sonicare InterCare heads in a compact size. Easily attach to any Philips Sonicare brush except Essence and PowerUp