I just hot my roots done yesterday. Not with a permanent . Through my past two pregnancys I did too. My hairdresser actually comes to my house so I don't have to go to the salon and breath all the fumes. I asked my midwife this time, as this is the first time I've had a midwife and not an ob , and she said there was nothing that clearly states that dying your hair actually harms the baby. But obviously to do it only when u must. And I waited, and man did I need to! I was embarrassed to leave the house! Feel much better now!!!