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This study found that human hair can be classified into eight main types based on objective measurements of shape, rather than ethnic categories, enhancing the understanding of hair diversity globally.

This article reviews the structure and chemistry of hair across ethnicities and how these factors affect hair properties and treatment responses, but reports no new research findings.

This study concluded that the curliness of human hair, regardless of ethnicity, originates from the inhomogeneous internal nanostructure due to differences in the distribution of two types of cortices.

This review discusses the genetic basis of woolly hair syndrome and its potential link to heart disorders, highlighting recent discoveries of new molecular pathways and suggesting possible future treatment options.

This study describes a novel FUE device that may perform successfully across various patient scenarios, adapting to differences in skin firmness, thickness, and hair curliness.

Genetic studies on hair traits can improve understanding of health and disease.

This study found that the curl in hair is due to the arrangement of different cell types, with shorter paracortical cells inside the curve and longer orthocortical cells outside.

Curly and straight hair differ in how their internal fibers are arranged.

This review discusses the genetic and biological factors influencing hair curliness, revealing strong links to specific protein variations, and reports no new clinical results.

In this study, researchers found that the curliness of human hair is associated with an asymmetric structure at the cellular level, particularly in the differentiation of the precortex.

This research explores the use of serial block-face scanning electron microscopy to model the complex architecture of sheep wool fibres, focusing on the role and distribution of para- and ortho-cortical cells in determining wool curliness, though the mechanism remains unclear.

This study examined hair classification based on geo-racial origin, observing that Caucasian and Mediterranean hair differs morphologically from African or Asian hair, with differences in density, thickness, and fiber shape contributing to varied hair characteristics such as color and curliness.

This review examines the androgen-dependent subtype of acquired progressive kinking of the hair and suggests it may be an early indicator of androgenetic alopecia, emphasizing the importance of distinguishing between subtypes for clinical decisions.

In this study, ultrastructural examination of hair in children treated with valproic acid showed a normal hair surface and cuticular pattern, despite reported hair changes with the drug.

This study found that while genetic ancestry affects physical appearance traits in Latin American populations, it accounts for only a modest portion of the observed variation.

This study presents the first reported case of woolly hair nevus appearing during adolescence, with significant improvement observed 5 years later and structural changes in the hair documented.

This study produced a high-coverage genome of the Tyrolean Iceman, revealing no Steppe-related ancestry but significant Anatolian-farmer-related ancestry, and found genetic markers associated with darker skin, male-pattern baldness, type 2 diabetes, and obesity, aligning with observations of his mummified body.

This study of African-American women found that those perceiving greater hair breakage showed lower break stress and higher premature failure rates, linked to grooming practices and hair curvature.

This study found that using ablative fractional CO₂ laser therapy combined with FUE treatment in patients with post-traumatic eyebrow scars and defects improved follicular survival rates and resulted in well-defined eyebrow shapes.

A mutation in the KRT74 gene causes woolly hair by affecting hair texture.

A mutation in the KRT74 gene causes woolly hair by affecting hair texture.

This research suggests that geometric classification of hair into fewer groups may be more reliable and useful for studying hair characteristics, rather than racial descriptions, especially in medical and forensic applications.

This study found that the structural and chemical composition of human curly hair may resemble that of sheep wool, implying a shared characteristic among mammals with wavy hair.

This study identified new geometric and mechanical parameters for curly and kinky/coily hair, which may inform more effective personal care products tailored to these hair types.

This study used quantitative methods to identify new geometric and mechanical parameters of curly and kinky/coily hair, aiming to improve classification and develop better personal care products for these hair types.

This study found that 53% of Japanese women have straight hair while 47% have varying degrees of curved hair, with distinct structural differences observed in the internal makeup of curved hair fibers.

This review suggests that multifunctional cosmetic systems, particularly HIVEN Curl Code ®, may help control frizz and maintain curl definition in highly curly hair by utilizing various conditioning and biofunctional ingredients.

This study validated a new tool for assessing curly hair manageability, finding that hair curvature is a key factor influencing hair practices and product attitudes among women with natural curly hair.

Polisorbate 20 is not suitable for curl creams due to instability.

This study aimed to identify new quantitative geometric and mechanical parameters for curly and kinky hair using various microscopy and mechanical analysis methods, revealing correlations between hair fiber geometry and mechanical performance to enhance personal care product development and promote cultural inclusion.