Hair Coach

L'Oreal unveiled a connected hairbrush, the Kerastase Hair Coach, at CES. The Hair Coach is a brush equipped with sensors and technology powered by Nokia-owned Withings to measure the quality of hair and effects of different hair routines.

This brush features a microphone to identify patterns in brushing, as well as an accelerometer and gyroscope. Users can look at a companion app to tell how often their hair is being brushed -- and whether it has been over-brushed. Hair Coach will be available in the fall.