May 2010 in “Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature” A mutation in the KRT74 gene causes woolly hair by affecting hair texture.
March 2010 in “Cosmetic Dermatology” Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.
13 citations
,
March 2015 in “Plastic and reconstructive surgery. Global open” Leg hair can be used for eyelash transplants, resulting in fuller lashes with less maintenance.
4 citations
,
February 2008 in “Dermatologic Surgery” Hair transplant surgery successfully restored a woman's pubic hair, improving her appearance and satisfaction.
September 2025 in “OPAL (Open@LaTrobe) (La Trobe University)” SELP::KP improves hair strength, elasticity, and health, making it a promising hair cosmetic.
Transplanting beard hair into a scalp wound after hair transplant surgery improves scar appearance and hair keeps its normal traits.
Pangolin scales evolved for protection, hardening with age, due to keratin gene diversification.
November 1919 in “The Journal of Hellenic Studies” The bronze head shows the high skill and beauty valued by ancient Greek sculptors.
January 2009 in “Nihon Keshouhin Gijutsushakaishi/Journal of S C C./Nihon Keshouhin Gijutsushakai kaishi” Curved human hair has different structures on each side, which might cause its shape and is similar to wool.
February 2024 in “Journal of Dermatological Science” Curved hair can develop when hair cells merge abnormally during growth.
4 citations
,
July 2010 in “International Journal of Cosmetic Science” Curved human hair has different structures on its convex and concave sides.
28 citations
,
March 2014 in “Biological reviews/Biological reviews of the Cambridge Philosophical Society” The document concludes that hair curvature can be explained by the growth patterns caused by the shape and separation of cells in the hair follicle and is affected by specific molecular pathways.
95 citations
,
October 2007 in “International Journal of Dermatology” A new method accurately classifies hair types, showing global hair diversity.
62 citations
,
December 2008 in “Journal of structural biology” Hair curvature in Japanese people is linked to specific cell types and filament arrangements in the hair cortex.
Frizzy hair is fragile and can lead to hair loss and damage if not properly cared for.
1 citations
,
January 2025 in “International Journal of Cosmetic Science” Age-related hair curvature increases due to internal structural changes from grooming.
18 citations
,
January 2015 in “Journal of medical genetics” New genes linked to woolly hair have been found, which could help treat it and change hair texture.
21 citations
,
June 2023 in “Proceedings of the National Academy of Sciences” Tightly curled scalp hair helps reduce heat from the sun, protecting against overheating.
22 citations
,
January 1985 Water makes hair more flexible, especially the outer layer.
16 citations
,
October 1992 in “Journal of cutaneous pathology” Bubble hair deformity may be caused by hair shaft trauma and can improve with gentle hair care.
March 2023 in “International Journal of Dermatology” COVID-19 can cause hair to become progressively kinked.
November 2021 in “Clinical, cosmetic and investigational dermatology” An elderly woman with cancer improved after treatment for a rare skin condition with coiled hairs.
15 citations
,
January 2011 in “International journal of trichology” Using a hot iron on wet hair can cause dry, brittle hair with air bubbles inside.
April 2017 in “Journal of Dermatological Science” Asymmetric hair follicle differentiation causes the unique shape of kinky hair.
February 2013 in “Journal of the American Academy of Dermatology” Uncombable hair syndrome causes dry, frizzy hair that can't be combed flat, seen in a young child.
13 citations
,
January 2001 in “Pediatric dermatology” A dark-haired Chinese girl had hair that looked banded under certain light but was normal under a microscope.
19 citations
,
January 2009 in “International review of cell and molecular biology” Hair's strength and flexibility come from its protein structure and molecular interactions.
4 citations
,
April 2019 in “Cosmetics” Hair stiffness is higher when it has more para-like cortical cells.
49 citations
,
June 2004 in “Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences” Human hair becomes weaker and stretches more easily at higher temperatures.
23 citations
,
July 1994 in “Journal of Dermatological Science” Pili torti hair twists due to uneven outer root sheath cell development.