Different treatments change the strength and flexibility of human hair.
13 citations
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March 2017 in “Skin Research and Technology” Formaldehyde damages curly hair more than glyoxylic acid.
January 2026 in “Frontiers in biomedical technologies” DHT causes thicker and less elastic skin, linked to hair loss.
February 2019 in “PubMed” The research found that twisting hair fibers can show changes in stiffness and damage, and help tell apart different hair treatments.
2 citations
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January 2015 in “Sen'i Gakkaishi” Washing permed hair after using thioglycolic acid helps reform strong bonds, making hair stronger.