★Compatible with Phillips Sonicare, ProtectiveClean, ExpertClean,DailyClean,2 Series 3 Series, 4100/2100/9900Plaque Control,Gum Health, EasyClean, Essence+, FlexCare, HealthyWhite and HydroClean Philips Brush Handle, (NOT Compatible with Essence,Sonicare One,HX5611/01 Essence) ★US DuPont Bristles: Our brushes are made with DuPont bristles, which are the most representative high quality nylon bristles. With DuPont bristles, our replacement brush heads can be used for a long time without deformation, are more durable and give you a more perfect cleaning experience. ★End-rounded Bristles: We have adopted a variety of end rounding techniques for our brush bristles. The protruding bristles on the top, middle and bottom of the brush undergo the first rounding process; then the concave part is rounded a second time to ensure that each tuft of bristles meets the standard. The multi-process is only to better protect your teeth and oral health. ★Easy to Install - Our replacement brush heads adopt bamboo style bottom design, which increase the stability of the replacement brush head and increase the friction, making it easier to install and remove the brush head. And our replacement brush heads have an anti-slip design inside to ensure stable performance. ★Vibration and Noise Reduction: Our replacement brush heads arew made of one-piece moulding technology to increase the speed of power transmission. This reduces noise while making the replacement brush head more stable for use. There is a 0.5-0.8 mm gap between the brush head and the handle to ensure normal vibration transmission. ★Advanced Bristle Implant Technology: Our replacement brush heads all use advanced bristle implantation technology, which allows the number of bristles to be twice as many as other brush heads. The bottom of each bristle bundle is fixed with copper metal sheets, which can prevent bristles from falling off, increase the durability of the brush head and greatly improve the cleaning ability. ★Suitable for Home Use: If you purchase our product, you will receive 12 replacement toothbrush heads neatly placed in a blister case. Each brush head is marked with a letter on the front to make it easy to distinguish without worrying about confusion. ★Hygienic Cap: Each replacement brush head comes with a hygienic secure cover to keep your bristle free of dust and debris. ★Reminder Bristles: Our blue indicator bristles discolour to let you know when to replace them, don't need to worry. Dentists recommend replacing the brush head at least once every 3 months. replacement heads