23 citations
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January 2016 in “Forensic Science International” This study found that in vitro heat straightening of hair reduced THC and cocaine concentrations but increased CBN and BZE levels, suggesting heat conversion of these substances.
55 citations
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March 2007 in “Journal of cosmetic dermatology” This review discusses the historical development of hair straightening products for Afro-ethnic hair and reports no new research findings.
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.
December 2025 in “Biopolymers” This study found that chemically treated hair, particularly when subjected to both acid straightening and bleaching, experiences more significant structural damage when exposed to heat, highlighting key changes in both the internal and surface components of hair fibers.
March 2010 in “Cosmetic Dermatology” Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.
