The Kerastase Hair Coach smart brush is displayed at Unveiled, ahead of the 2017 International CES, a trade show of consumer electronics, in Las Vegas, Nevada, January 3, 2017. Photo by Molly Riley/UPI Stock Photo - Alamy
kérastase X withings smart brush tells you how healthy your hair is
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Meet the Kérastase Hair Coach - the world's first-ever smart brush
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