September 2025 in “Sahel Journal of Life Sciences FUDMA” Chemical hair straighteners can severely damage hair and scalp with repeated use.
8 citations
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November 2019 in “International Journal of Morphology” Henna dye improves hair cuticle and thickness but effects vary by hair type and health.
January 2026 in “Journal of Cosmetic Dermatology” Microneedling can weaken hair in some AGA patients.
4 citations
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January 2000 Piedraia hortae fungi dissolve both the outer and inner layers of hair.
NaOH treatment improves hair strength and suitability for textiles.