"Selling them a new warning for people you permanent hair dye and chemical straighteners study says that they may be associated with an increased risk for breast cancer researchers at the national institutes of health tracked almost forty seven thousand American women and those who reported using permanent dyes are straight hers had a greater chance of developing breast cancer than others in the study especially if they identified as black research say that maybe because the chemical products formulated for black hair are different than those for people who identify as white one thirty eight a KCBS at"