Permanent hair dye and chemical hair straightener use was linked to a higher risk of breast cancer in a new study from researchers at the National Institutes of Health. The risk is more than six times higher for black women.

Permanent hair dye and chemical hair straightener use was linked to a higher risk of breast cancer in a new study from researchers at the National Institutes of Health. The risk is more than six times higher for black women. https://t.co/huFVckzxzM

— CNN (@CNN) December 15, 2019