• Wide compatibility: Suitable for most Philips Sonicare models, including ProtectiveClean 4300, DiamondClean, 2 Series, 3 Series, EasyClean, Essence+, FlexCare, HealthyWhite, 5300, 3100, 9000 and HydroClean. • Plaque removal: Flexible design that removes up to 10 times more plaque in hard-to-reach areas compared to a manual toothbrush. • Copper-free bristle technology: Innovation that offers greater wear resistance, elasticity, and environmental friendliness without deforming easily. • Gentle care: Nylon bristles with rounded tips for effective plaque cleaning while protecting gums and soft tissues. • Silicone protection: Soft silicone-wrapped top to increase comfort during brushing and prevent accidental damage to teeth. • Replacement reminder: Blue indicator bristles fade to let you know it's time to change the brush head, recommended every 3 months. • Noise and vibration reduction: Silicone and stainless steel interface designed to minimize noise and movement during use. • Certified quality: Manufactured in compliance with safety and health standards with CE and FDA approval.