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 Hi-Can Bed – Will Make You Look Good When Lazy X1 – Water Bike is as Cool as it Gets Best Use of the Oculus Rift so Far Hover Your Precious Objects – Levitron Mind-Blowing Planetarium Watch Shows Planets Orbiting the Sun Shotgun Flashlight