The ultra-fine CUREN® filaments of the Black Is White “Carbon” brush heads are coated with activated carbon. For stylish, innovative, gentle whitening. The CUREN® filaments of the new brush head are coated with activated carbon particles for gentle but effective tooth whitening: Gentle and effective: Ultra-fine CUREN® filaments coated with activated carbon particles Every single area can be easily reached: The CURACURVE® ergonomics are all down to the perfect bend Drop-like design for high-precision cleaning, tooth by tooth Extra pleasant: rubberised back Supports the hydrodynamic effect Developed with Prof. Dr. med. dent. Ulrich P. Saxer Compatible with all CURAPROX sonic toothbrushes Made in Switzerland Recommendation: replace after three months at the latest; with braces and brackets, replace after six to eight weeks.