A marked increase in sensitization was found for p-phenylenediamine base (54% vs 45.9%), 4-aminobenzene (40.7% vs 31.9%), ammonium thioglycolate (2.7% to 12.3%), ammonium persulfate (7.9% to 14.3% ...

You take breaks from heat-styling, use hair masks regularly, and extend the time between color appointments. You’re undoubtedly meticulous about your hair care, but somehow, your strands still ...

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