Can you bleach your roots then put a box dye on?

no it is very bad for your hair and may fall out. i wouldn't try.

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This method is often done in the salon, except I highlight the hair with bleach and then go back and add the desired color. The color used is not from a box, of course. I use a professional line, so I really can't be much help with the box color you're choosing to use. Keep in mind however, that if the correct color pigment is not used, the hair may turn an undesirable color, forcing you to seek professional help from a stylist. This color correction service is very costly and you may want to consider saving yourself valuable time and money by having a licensed hair stylist color your hair for you.