Philips Sonicare Optimal HX9034 / 10 spare heads 4 pcsPhilips Sonicare G2 brush heads Optimal Gum Care (formerly ProResults Gum Health) must be replaced at the 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 G2 Optimal Gum Care heads. They are standard size and easy to fit on any