Unknown: There are not adequate studies regarding the safety of hair dyes used during pregnancy. A study in 2005 showed a possible increased risk of childhood neuroblastoma. Precautions from the food and drug administration: follow package directions carefully. Wear gloves when applying hair dye. Leave the dye on your hair no longer than directed. Rinse your scalp thoroughly after using hair dye.
Answered 7/7/2012
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