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Bleaching hair removes its protective top layer and exposes more hydrophilic groups, changing its chemical surface and affecting how it interacts with products.

Curly hair breaks more easily, especially with chemical treatments, but simpler grooming reduces breakage.

A tough membrane between the outer and inner layers of human hair protects it from damage.

Hair health depends on various factors and hair loss can significantly affect a person's well-being; understanding hair biology is key for creating effective hair care treatments.

Hair texture changes with age due to varying levels of lipids.

The new automatic tool accurately measures hair thickness and is reliable.

Hair dyes vary in how long they last and how deeply they penetrate hair.

Hair aging is inevitable, but using the right hair care products can help maintain hair health.

New methods to classify curly hair types were developed based on shape and strength.

Asian hair is generally straight and thick, with unique disorders and properties, and more research is needed to understand it fully.

Trichoscopy helps diagnose hair and scalp disorders in dark-skinned people by identifying unique patterns.

A new system for classifying curly hair types using precise measurements can improve hair care products and cultural inclusion.

Dermoscopy helps quickly identify hair breakage in people of African descent.

K18® and Olaplex® both effectively repair bleached hair, improving its strength, smoothness, and overall health.

Different populations have distinct hair structures related to their ancestry.

Hair aging and loss are caused by genetics, hormones, environment, and grooming, with treatments like minoxidil effective for certain types of hair loss.

Hair lipids do not protect against humidity.

A cluster of sulfur-rich hair protein genes was found on chromosome 17.

Hair Tonic A, with white tea extract, is better for improving hair health.

Surfactants in shampoos and conditioners remove some but not all lipids from hair, and more research is needed to understand their full impact.

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

Afro-textured hair needs personalized care due to its unique genetic traits.

The document concludes that proper diagnosis and treatment of nonscarring alopecias can improve quality of life and hair regrowth is possible as the hair follicle remains intact.

Uncombable hair syndrome causes frizzy hair and can affect the nervous system, eyes, and ears, often co-occurring with other hair, skin, nail, and teeth conditions, and is linked to three specific gene mutations.

Hair's resistance to wear varies by ethnicity and treatment, with less wear indicating stronger hair.

Different sizes of keratin peptides can strengthen hair, with smaller ones possibly increasing volume and larger ones repairing damage.

Proteins like BSA and keratin can effectively style hair and protect it, offering eco-friendly alternatives to chemical products.

Lipids are important for healthy hair, but their exact role is not fully understood and needs more research.

Afro-textured hair is more fragile and prone to certain scalp conditions, requiring careful treatment and more research for effective management.

Hair style affects perceptions of age, health, and attractiveness more than hair color does.