This smart brush tells you if your hair is healthy The Kérastase Hair Coach is a hairbrush that connects to an app on your phone. Facebook Prev Article Next Article Gadgets Checkout these cool gadgets... Related Posts Briefcase Gun Google Goggles Makes The World More Googly The Nug – Micro knife on steroids Reinventing the Audio Jack with Magnets First Infinitely Variable Gearbox for Bikes Wireless Earphones Are Also In-Ear Smartphone