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 This umbrella opens inside out Outlet Night-light That Turns On When It’s Dark A-Bike Automated Desk-and-Chair That Feels Like Working on a Cloud Laser Equipped Missle Defence Aircraft Masturbating Robotic Hand – WTF!?