Blondes stop having more fun when their hair becomes brittle and falls out after too many hydrogen peroxide bleaches. So Procter & Gamble has devised a hairbrush to bleach, brush and protect hair all in one go (US 2003/0106564).
The new brush has two internal compartments: one releases peroxide bleach, the other a hair softening agent. The brush also has a battery-powered ultrasound generator and an acoustic reflector that focuses the ultrasound onto the brush’s bristles. During brushing, the ultrasound temporarily increases the size of pores in hair and drives in the softener, while the peroxide attacks the surface, reducing bleaching time from 30 to 5…
