Compatible with ALL Philips Sonicare handles, including DiamondClean and ProtectiveClean. Achieve whiter teeth in just 1 week vs a manual toothbrush. Stain-removal pad, made from densely-packed diamond-shaped bristles, removes surface stains caused by food and drink. BrushSync technology ensuring compatibility with a BrushSync enabled Philips Sonicare electric toothbrush. Always know when to replace. Always get an effective clean. Always know when to replace. Always get an effective clean. Brush heads become less effective after 3 months' use, but with BrushSync™ you'll be reminded before this happens. Your smart toothbrush will track how often and how hard you brush and will notify you when it's time for a replacement. Don't have a smart Philips Sonicare toothbrush? Just monitor your blue replacement bristles — when they turn white you'll know it's time for a fresh brush head.