whats the difference between using unhealthy hair dye when your pregnant and when your not? does it hurt the baby?

I am a hairdresser. I get asked the question of coloring your hair when pregnant. I have heard lots of different ideas about how hair color can affect your unborn child. I usually tell my clients that it is a personal decision. I have has lots of clients color thier hair while pregnant and go on to have healthy babies. If coloring your hair will make you more comfortable I say go ahead. There is no reason to have grey hair and a growing belly if you don't want to. Just talk to your Dr to get thier opinion on hair color and pregnancy.