Philips Sonicare Premium White Replacement Toothbrush Heads Smart Recognition Pack of 4 new in box Designed to work with all click-on Philips Sonicare models Same/next day shipping Offers welcome Polishing bristles remove surface stains to visibly whiten teeth in just 3 days for an exceptional deep clean Use with smart brush head recognition handle to unlock smart features Smart brush head replacement technology tracks how often and how hard you brush and will notify you when it is time to replace your brush head Bristles fade to let you know when it's time for replacement Recommended to replace brush head every 3 months to maximize effectiveness