At CES this week, L’Oreal showed off a new concept in hair care. The Kérastase Hair Coach is an “under $200” connected hairbrush designed to monitor the health of your hair. A bevy of sensors are used to alert you to problematic brushing habits and you are presented with a daily hair quality score. Based on your score and the expected temperature, humidity, and wind for the day, you are then presented with personalized styling and treatment tips as well as product recommendations (we are guessing they will be Kérastase products). But how does it work and do you really need this International CES Innovation Award winning gadget?