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 The Most Realistic Racing Simulator Rotates 360-Degrees at Up to 0.5 Gs, Fits in Your Living Room Air Swimming Fish – Cool Toy Mr.Knocky – The Drum Toy That You Really Don’t Need Google Cr-48 Chrome OS Netbook The Knife-Shooting Slingshot Bitlock – The World’s First Keyless Bike Lock