EXCELLENT CLEANING - Waveform design dense bristles cover hard-to-reach areas for enhanced sonic cleaning for deeper cleaning. Compared to manual toothbrushes, it is easier to remove stubborn tooth stains and effectively improve the overall health of the gums. HIGH QUALITY BRISTLES - Cusnikelo brush heads are made of end-rounded Dupont bristles , advanced bristles effectively remove stubborn tooth stains from the surface of teeth while providing comprehensive care for teeth and gums, bringing a comfortable brushing experience. REMINDER BRISTLES - Blue reminder bristles on the toothbrush head help you ensure the most effective cleaning possible. Dentists recommend replacing toothbrush heads every three months. If the blue reminder bristles fade to white, you need to replace the brush head with a new one. COMFORTABLE BRUSHING - End-round Bristles help to protect gums, enjoy the care of the dentist level. The metal ring design can balance the brush head vibration and reduce noise. IDENTIFY EASILY - Each brush head has a different color marking ring, perfect for family use, helping you easily distinguish which replacement head is yours. HYGIENIC PROTECTIVE COVER - Each brush head comes with a protective cover for safe clean storage away from dust. Great for travel carry! HIGH COMPATIBILITY - Cusnikelo brush heads are fully compatible with phillips sonicare replacement brush heads electric handles, compatible with Philips DiamondClean, DiamondClean Smart, 2 Series, 3 Series Gum Health, DailyClean, EasyClean, FlexCare Platinum, HealthyWhite, ProtectiveClean, PowerUp， All click-on and other snap-on Sonicare electric toothbrushes. SATISFACTION GUARANTEE -Your satisfaction is always our first consideration, please contact us if you have any questions. The top contoured bristles on our electric toothbrush heads fit naturally to the shape of your teeth and easily remove stubborn tooth stains in hard-to-reach areas. And the specially curved power tip makes reaching the teeth at the back of your mouth a breeze, Leaves your teeth feeling very clean, comfort and polished. Disclaimer: These toothbrush heads are manufactured independently by Cusnikelo.