Hair can retain a history of previous chemical treatments even after the visible result has faded.
That history can affect how hair responds to color, bleach, heat, and other chemical services.
Two sections of hair may look identical but behave very differently because one has been processed more heavily in the past.
That’s why honesty is so important.
If you used a box dye six months ago, say so.
If you tried to lighten your hair at home and it went orange, say so.
If you’ve been using a particular
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