File this under "bad hair news." The Brazilian Blowout, a popular hair-straightening treatment, has been found to contain formaldehyde, a known carcinogen. After stylists at Portland-area salons complained of symptoms such as nosebleeds and difficulty breathing, Oregon state officials tested the formulations in question. Even those advertised as formaldehyde-free contained from 4.85 percent to 10.6 percent formaldehyde. (Brazilian Blowout has released a statement.) We've long been wary of straightening treatments because of possible health risks, and this news is just one more reason we'll stick with the styling iron for now.