It's a miracle salon treatment for some women, who swear by the glossy, smooth tresses they leave with after getting a Brazilian blow-dry. But the fabulous, star-endorsed procedure has some detractors, too, mainly due to the chemicals that go into the process. Since the revolutionary treatment was exported from Brazil, many stylists have created their own proprietary concoctions to achieve the look. The process goes something like this: A stylist applies a keratin-rich solution to hair. Using a very hot straightening iron, the stylist adheres the solution to hair's cuticle, or outside surface, sealing in the keratin proteins. It traps moisture, adding a shiny veneer and hydrating hair. The treatment costs between $150 and $600, depending on the length and thickness of hair, and the results last from six weeks to a couple of months, depending on how often hair is washed. And it doesn't completely make hair stick-straight, so even girls who love their curls can have it done. However, there are a few health caveats that come with using the product.