52 citations
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February 2005 in “Biopolymers” In this study, chemical treatments during permanent hair straightening were found to randomize proteins in the cortex, aiding in the reconnection of disulfide bonds during oxidation.
4 citations
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January 2021 in “Skin appendage disorders” This review discusses hair straightening techniques, products, and safety risks, providing guidance for dermatologists to advise patients effectively; it reports no new clinical results.
In this summary, the researchers describe the Brazilian keratin treatment as a popular hair-straightening process that originated in Brazil in 2003 and has since gained global traction, particularly for smoothing and straightening curly or frizzy hair through a keratin-based product and heat application.
3 citations
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January 2004 in “Sen i Gakkaishi” This study found that adding dithiodiglycolic acid to the hair straightening process decreased chemical damage and preserved the structural integrity of the hair matrix compared to using thioglycolic acid alone.
This chapter discusses the chemical changes and possible heat-induced hair damage from thermal straightening, as well as controversies surrounding the safety of keratin straightening treatments, but it reports no new clinical results.
