The ultra-thin CUREN carbon filaments of the Black Is White brush heads are coated with activated carbon. Designed for elegant, gentle whitening. The CUREN filaments of the new brush heads are coated with activated carbon particles for gentle yet delicate whitening. Ultra-thin CUREN fibers coated with active carbon particles You can easily get anywhere: the ergonomics of the CURACURVE solution boils down to perfect curves The drop-shaped head allows very precise cleaning of each tooth in turn An added pleasure: you covered yourself in rubber It supports the hydrodynamic effect Designed in cooperation with dentist Professor Ulrich P. Saxer Fits all CURAPROX sonic toothbrushes Made in Switzerland Recommendation: replace after three months of use at the latest; for braces and braces after six to eight weeks. This is a medical device. Use it according to the directions for use or the label.