These toothbrushes are compatible with all Philips click-on models. Dentists recommend replacing your brush every 3-4 months.Sonipower brush head refills feature indicator bristles that fade halfway to help remind you when to replace your toothbrush head so you maintain a superior clean vs a regular manual toothbrush. Years of research go into making every toothbrush head unique so you’re sure to find one that fits your specific oral care needs Modeled after the round shape of professional dental cleaning tools Sonipower replacement brush heads eliver a superios clean vs a regular manual toothbrush. These toothbrushes are compatible with Compatible with these series: Philips Sonicare 2 Series plaque control 3 Series gum health DiamondClean DiamondClean Smart EasyClean Essence Essence+ FlexCare FlexCare Platinum FlexCare Platinum Connected FlexCare+ for Kids HealthyWhite HealthyWhite+