A study published online in the international Journal of Cancer suggests that breast cancer risk is increased with more frequent use of permanent hair dyes and chemical hair straighteners.
Using a data from 46, 709 women in the sister study by the National Institute of Environmental Health Sciences, it found that:
Increased risk for African-American women who use permanent dyes every 5-8 weeks
Increased risk for white women who use permanent dyes every 5-8 weeks
While we are exposed to many thing that could potentially contribute to breast cancer, avoiding these chemicals might be one or more thing women can do to reduce their risk of breast cancer– Dale Sandler, Ph D.