Philips Sonicare S2 Sensitive Replacement Brush Heads, Pack of 4, White - HX6054/10: Ultra-soft brush head for sensitive teeth and gums for a gentle yet effective brushing. • 70% bio-based plastic* • Removes 10x more plaque in hard-to-reach areas** • Up to 5x healthier gums in 6 weeks*** • Proven effectiveness with extra softness means gentler on teeth and gums. • Click-on brush head fits all Sonicare handles**** • Always know when to replace your brush head with BrushSync  With more than 3,000 ultra-thin bristles, the thinnest of bristles (0.1mm) of any Sonicare brush head, the S2 Sensitive delivers a gentle yet effective brushing experience, removing 10x more plaque in hard-to-reach areas. As you brush your teeth, the extra soft bristles will also gently brush your gum line, for improved gum health in just 6 weeks. Always achieve the highest cleaning performance with Philips Sonicare's advanced sonic technology. Through its extra-soft bristles, the S2 Sensitive brush head is clinically proven to remove plaque effectively, while being gentle on your gums. We are working towards reducing the use of fossil-fuel based plastic in our products. That's why 70% of the plastic used in this brush head is bio-based.* Brush heads become less effective after three months of use. With BrushSync you'll be reminded precisely when to replace your brush head, tailored to your brushing behaviour. This click-on brush head fits perfectly with any Philips Sonicare handle****. Its click-on design makes cleaning and replacing the head incredibly simple. Contents: S2 White Sensitive Replacement Brush Heads x 4 Substantiations: *allocated to this brush head on a mass balance basis **than a manual toothbrush in 6 weeks ***than a manual toothbrush ****excludes Philips One, Essence