Hair dye and chemical straightener use and breast cancer risk in a large US population of black and white women. Int J Cancer. 2020;147(2):383-391. doi:10.1002/ijc.32738 U.S. Occupational Safety & ...
An allergic reaction to hair dye will usually start within two to three days of using the dye and get better in several days to weeks. First-time reactions, however, may take longer to show symptoms, ...