Philips Sonicare Optimal HX6074 / 27 spare heads 4 pcsThe Philips Sonicare W2c Optimal White compact brushheads need to be replaced at prescribed intervals , both to maintain full functionality and hygiene. 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 W2c Optimal White heads in a compact size. Easily attach to any Philips Sonicare brush except Essence and