Pregnancy and hair dyeing
The hazardous connection between pregnancy and hair dyeing comes from the application of the color itself. A full dye job involves contact between the hair dye and the skin, which was thought to be potentially harmful to the fetus, especially in the first trimester. Most research, however, has found that the chemicals found in both permanent and semi-permanent dyes aren’t highly toxic and are safe to use during pregnancy. The small amounts of dye that may be absorbed by the scalp typically remain in the skin, making the chances of them reaching the fetus very small.