SNAP-ON SYSTEM PERFECT FITS - The toothbrush replacement heads are compatible with entire lineup of phillips sonic care snap-on electric toothbrush handles, such as Flex Care Flex Care+ Easy Clean Healthy White Diamond Clean, Sonicare 2 series plaque control, sonicare 3 series Gum Health and more. FUNCTIONAL DESIGN - The polished and rounded bristles care for an effective and gentle cleaning, optimized swinging movements keep your gum health and better solve the bleeding situation of gums. EXTRA CLEAN & GUMS HEALTH - The toothbrush heads effective cleaning even at hard to reach places due to dual contoured waveform soft bristles design, do extra clean, reduce gingivitis, remove plaque and stain, control tartar and improve gum health up to 100% better than a manual toothbrush. HEALTH & SAFETY - Not all generic replacement toothbrush heads are created equally. The brush heads are made at the highest health and safety standard, perfect fitment and no rattles. REMINDER BRISTLES - the reminder bristles will fade when a replacement is needed, usually three months, every head with its own hygienically secure cover.