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Originally Posted by texas*princess
what does dying dead cells on your head (hair) have to do with a baby inside you? does the dye sink into your head and travel to the fetus or something?
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It's not exactly the dye, but the fumes given off by the process. Ammonia is harmful to breathe in, and is present in most dyes. I'm sure that other gases released in the process can be harmful also.
However, in the second and third trimesters the fetus is stronger and, as such, studies have shown that it is within acceptable limits to dye (not bleach) a pregnant lady's hair then.