The Philips Sonicare Optimal Gum Care brush head features a convex trim profile specifically designed to offer 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% more than a manual toothbrush.Use with a Philips Sonicare BrushSync compatible handle (DiamondClean Smart or ProtectiveClean) to unlock Smart features: BrushSync mode-pairing triggers your handle to select optimal mode and intensity level for exceptional plaque removal (certain models only) while 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 replacement.Replace your brush head every 3 months as recommended by the American Dental Association. A fresh brush head every 3 months maximizes the effectiveness of Philips unique Sonicare technology. allocated to plastic of brush head on mass balance basis based on a study of over 2,600 dental professionals (dentists and hygienists) conducted in the United States, Canada, Japan, China, Korea, Thailand, Germany, the United Kingdom, Switzerland, France, Belgium, Austria, Italy, Spain, Sweden in 2022-2023