The Philips sonic are plaque control brush head. Designed to work with multiple sonic are models, these Snap-on replacement brush heads gently remove 6x more plaque than a manual toothbrush. Reminder bristles fade to let you know when it's time for replacement. Replace your brush head every three months as recommended by the American dental association. Up to 6x more plaque removal versus a manual toothbrush. Curved bristles conform to teeth to remove more plaque. Power tuft cleans hard-to-reach areas, reminder bristles fade when replacement is needed. Dentists recommend replacement every 3 months for optimal results. Suitable for these models HealthyWhite+, 2 Series plaque control, 3 Series gum health, DiamondClean, EasyClean, FlexCare, FlexCare Platinum, FlexCare+, HealthyWhite and for Kids.