Full power for maximum cleaning performance. With slightly stronger Curen filaments. And yet soft and gentle on the gums. The difference between effective and perfection. Unbelievable: a CHS 300 Power brush head provides maximum performance for sonic toothbrush professionals. This power head cleans to perfection yet is still extremely soft and gentle. Our Curen filaments have a diameter of only 0.152 mm which alongside its hydrodynamic effect ensures it can clean areas other filaments are unable to reach. , , PLEASE NOTE: The design of this brush head has changed and now has a curacurve head, similar to the Hydrosonic pro brush heads. The brush heads you receive may look different to those pictured while we transition to new stock.