The Philips Sonicare Optimal plaque Control brush head features a concave trim profile specifically designed to target tooth-decaying plaque by hugging teeth and offering better conformity and surface-area coverage. Compatible with all click-on Sonicate models, these replacement brush heads remove up to 7x more plaque than a manual toothbrush. Use with a Philips Sonicate brush Sync(TM) compatible handle (Diamond Clean Smart or protective Clean) to unlock Smart features: brush Sync mode-pairing triggers your handle to select optimal mode and intensity level for exceptional plaque removal (certain models only); brush Sync replacement technology tracks how often and how hard you brush and will notify you when it is time to replace your brush head.