SUPERIOR CLEANING - Powerful sonic wave transmission technology coupled with 3D cut bristles that conform to the shape of your teeth, removing up to 10 times more plaque in hard-to-reach areas.SHOCK-ABSORBING DESIGN - The brush head is wrapped in a layer of air-cushioned soft silicone that absorbs the impact and allows it to gently touch your teeth and gums without jarring or numbing your teeth, improving the comfort of brushing.GENTLE AND EFFECTIVE - 20% more surface area for brush head and implant bristles to clean up to 4 teeth at a time. Medium soft DuPont bristles with rounded ends to prevent damage to teeth and gums.NO GUESSING WHEN TO REPLACE - Blue reminds the bristles will slowly fade in color and when the color fades about a third of the way down, it's a reminder that it's time for a new brush head for optimal cleaning results. (Typically three months)PERFECTLY COMPATIBLE - Toothbrush head designed for Philips Sonicare. Compatible with all Philips Sonicare snap-on electric toothbrushes.(Not compatible with screw-in brush handles Advance, Essence, Elite, CleanCare, Xtreme and One Series.)