Philips Sonicare ProResults HX9073 / 07 spare heads 3 pcsThe Philips Sonicare brush heads 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 three Sonicare heads, each of which excel in a different area of oral hygiene. They are standard size and easy to fit on any Philips