Hair coloring and bleaching can permanently break down hair protein and temporarily change its properties.
October 2024 in “UNESP Institutional Repository (São Paulo State University)” Straightening and dyeing damage hair structure.
9 citations
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December 2018 in “Journal of Analytical Toxicology” Ethyl glucuronide levels in hair can change when exposed to artificial sunlight, depending on hair color and thickness.
2 citations
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January 2011 Relaxers straighten African hair by breaking down its helical structure using strong bases.
4 citations
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January 2007 in “Sen'i Gakkaishi” Permed hair degrades faster and shows more damage after protease treatment compared to untreated hair.