Philips Sonicare HX9064 / 33 spare heads 4 pcsBrush heads Philips Sonicare W3 Premium White will help you to smile white. The heads must 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 W3 Premium White heads in black. They are standard size and easy to fit