July 2025 in “International Journal of Cosmetic Science” In this study, researchers developed a new 6-point scale for evaluating heat damage to hair from straighteners, finding a strong correlation between technical damage measurements and human perception of hair damage.
February 2019 in “PubMed” This study explores torsional measurements of single hair fibers to differentiate the effects of cosmetic treatments on hair structure, highlighting their potential to reveal shear stiffness changes related to cuticle damage.
6 citations
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December 1966 in “Textile Research Journal” Animal hair fibers like wool and mohair are strong when dry, but vicuna fibers are very brittle.
3 citations
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September 2020 in “Journal of cosmetic dermatology” This study found that coconut oil significantly increased the tensile strength of twisted hair fibers due to its ability to penetrate the hair core, in contrast to mineral oil.
September 2024 in “Heliyon” In this study, researchers observed that even a single session of hair dyeing can damage hair fibers, with significant worsening of mechanical properties and protein composition after three or more consecutive treatments, emphasizing the need to consider the cumulative impacts of dyeing on hair health.