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Glyoxylic acid straighteners cause more protein loss but have similar hair strength effects as traditional alkaline straighteners.

Dye enters hair at the edges of cuticle cells and penetrates more from water than alcohol-based solutions.

Hair ages as the cuticle wears down, especially beyond 1 meter from the root, affecting its strength and shine.

Chemical treatments and daily stresses damage hair, especially the cuticle layer.

Human hair has different protein structures in its cuticle and cortex.

Hair follicle cells become four types: medulla, cortex, cuticle, and inner root sheath.

Sunlight damages hair, causing cuticle loss, protein changes, and discoloration.

Abnormal cuticle and hair shaft medulla cause hair loss in androgenetic alopecia; sonography helps diagnose and manage it.

Some mutant mice have hair with abnormal cross-linking, mainly in the cuticle, not affecting other hair parts.

The cuticle significantly contributes to hair stiffness, making up about 60% of the total bending stress.

Perming and bleaching damage hair differently, with bleached hair having more cysteic acid in the cuticle.

Henna dye improves hair cuticle and thickness but effects vary by hair type and health.

Defective mink guard hairs have split tips and missing cuticle cells, causing a metallic sheen.

Hair fibers break by cuticle cell slipping, shape changing, cuticle fraying, and surface cracking when stretched under specific conditions.

Two mouse mutants have defective hair cuticle cross-linking.

High-resolution x-ray images showed three main structures in human hair: medulla, cortex, and cuticle.

Human hair's strength and flexibility vary by ethnicity, damage, and treatment.

AFM helped show how hair changes under tension and the effects of damage and conditioner.

Chemical hair straightening changes hair proteins and mostly fixes broken bonds.

Shampoo pH can affect hair health, with alkaline shampoos potentially causing damage and acidic shampoos reducing frizz.

Permanent waving weakens hair by altering its protein structure.

Loose anagen hair syndrome is caused by structural abnormalities in the hair follicle's inner root sheath.

Hair bleaching causes significant damage to hair and skin.

Bleaching hair causes severe structural and chemical damage, including protein loss and oxidation.

Melanin in black hair protects it from sun damage better than light-brown hair.

μ-Crystallin may help hair growth by affecting thyroid hormone levels in mouse hair follicles.

The study found that thioglycolic acid breaks down hair bonds more consistently than l-cysteine, which is less damaging to hair.

Modified keratin binds better to hair, especially bleached hair.

Hair's strength and flexibility come from its protein structure and molecular interactions.

Human hair has more unsaturated fats inside than on the surface, and certain lipids may help bind the outer and inner layers together.