The W2 Optimal White brushhead is perfect for those who want to go beyond deep cleaning to remove surface stains for a radiant, whiter smile. This brush head is also great for maintaining brightness between professional whitening treatments. It removes up to 7x more plaque than a manual toothbrush. The DiamondClean's stain-removal pad, made from densely-packed diamond-shaped bristles, removes surface stains caused by food and drink, leading to a whiter smile in just 7 days. The BrushSyncTM mode-pairing feature syncs with compatible Philips Sonicare toothbrush handles to select the optimal brushing mode and intensity level for exceptional whitening. Brush heads should be replaced every 3 months; blue replacement bristles turn white when it's time for a new one. All Philips Sonicare brush heads are safe and gentle on teeth and gums. They are designed for easy click-on replacement and cleaning and are compatible with all Philips Sonicare toothbrush handles except Philips One and Essence.