Superior performance at a superior value. 5-pack. Standard size. Click-on. All-around cleaning. Reminder bristles: Blue bristle colour fade away. Bristle stiffness feel: Regular. Plaque removal: Removes up to 2x more plaque*. Replacement: Every 3 months. Suitable for these models: HealthyWhite+, 2 Series plaque control, 3 Series gum health, DiamondClean, EasyClean, FlexCare, FlexCare Platinum, FlexCare+, for Kids, HealthyWhite Optimized Philips Sonicare performance This Philips Sonicare toothbrush head features a contoured profile to naturally fit the shape of your teeth and to clean hard-to-reach areas. Philips Sonicare brush heads are vital to our core technology of high-frequency, high-amplitude brush movements performing over 31, 000 brush strokes per minute. Our unparalleled sonic technology fully extends the power from the handle all the way to the tip of the brush head. This sonic motion creates a dynamic fluid action that drives fluid deep between teeth and along the gum line for superior, yet gentle, cleaning every time. This brush head clicks on and off your brush handle for a secure fit and easy maintenance and cleaning. It fits all Philips Sonicare toothbrush handles except: PowerUp Battery and Essence. At first glance it may not be obvious, but brush heads lose stiffness and gradually wear down over months of normal use. Our blue reminder bristles fade to white and help you recognize when it's time for a replacement. For optimal results, replace your brush head every three months | Philips Sonicare Simple Clean Brush Heads - Standard Size 5s