Hair dye ingredients frequently produce positive results in short-term in vitro genotoxicity tests, although results from in vivo assays are typically negative, especially for ingredients in use today. The use of hair dyes is quite widespread resulting in the exposure both for persons working in hairdressing salons and for individuals who have their hair dyed. This provides the opportunity to add to the data from standard in vitro and in vivo genotoxicity tests by investigating whether or not genotoxic responses are detected in such exposed individuals. A number of biomonitoring studies of humans exposed to hair dyes have been conducted using either cytogenetic alterations or DNA damage as measures of genotoxicity, or urine mutagenicity as a measure of exposure to genotoxic compounds. In this paper, each study is critically reviewed and interpreted. Overall, there is no consistent evidence of genotoxicity in humans exposed to hair dyes occupationally or through individual use.
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