The Philips Sonicare Optimal Gum Care Replacement Toothbrush Heads feature a convex trim profile specifically designed to provide a gentle, even clean along the gum line. Compatible with all click-on Sonicare models, these replacement brush heads are proven to improve gum health up to 100 percent better than a manual toothbrush. Use them with a Philips Sonicare BrushSync compatible handle (DiamondClean Smart or ProtectiveClean) to unlock smart features: BrushSync mode-pairing triggers your handle to select the optimal mode and intensity level for exceptional plaque removal (only available on certain models); BrushSync replacement technology tracks how often and how hard you brush and will notify you when it is time to replace your brush head. Also, reminder bristles fade to let you know when it’s time for a replacement. It is recommended by the American Dental Association to replace your brush head every three months. A fresh brush head every three months maximizes the effectiveness of Philips’ unique Sonicare technology. Improve your gum health with the Philips Sonicare Optimal Gum Care Replacement Toothbrush Heads.