Keratin straightening There are at least a half a dozen at-home keratin treatments that have launched in the last year, and many of them are available at the drugstore. With all the controversy about dangerous ingredients like formaldehyde in some of the salon versions, I decided to try a do-it-yourself kit instead. Even though I opted for the higher-end Keratin Perfect 30 Day Brazilian Hair Smoothing System, $90, I was underwhelmed by the results. My hair was noticeably smoother, but the effects only lasted for a few days -- not 30. Plus, some of the shorter strands around my face became brittle and started to break off at the ends.
"It's kind of scary -- anyone can buy a professional iron that goes up to 450 degrees," says Solano. "But not everyone's hair can take an iron that hot." Unfortunately, both at-home and in-salon keratin treatments generally require that you flat iron your hair at 450 degrees. "In this case, doing it at home is going to be more damaging to your hair," she explains.
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