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Keratin Hair Straightening

Keratin hair straightening, also called the Brazilian blowout or Brazilian keratin treatment, is a miracle in a bottle for the frizzy-haired, transforming unruly locks into smooth, manageable tresses.

Who shouldn't use it: Poor ventilation in the salon during keratin treatment can cause itching and stinging of the eyes and throat. Formaldehyde is a known carcinogen, and the long-term effect of keratin treatments is unknown. Ask about the formaldehyde content of your keratin treatment, as some have a formaldehyde content as high as 20 percent. Aim for formaldehyde content of 2 percent or lower.