(NBC) - Permanent hair dyes and chemical straighteners may be associated with an elevated risk for breast cancer, according to a new study published in the International Journal of Cancer.
The research was conducted by the National Institute of Environmental Health Sciences.
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It shows women who regularly used permanent hair dye were 9 percent more likely to develop breast cancer than those who did not.
Women who used chemical hair straighteners had a 30 percent higher risk.
African American women who used permanent dyes were significantly more likely to develop breast cancer than their white peers.
