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Nickel, cobalt, balsam of Peru, fragrance mix, carba mix, and propylene glycol are common allergens causing scalp contact dermatitis.

Caucasian hair is denser, but Asian hair is thicker in female pattern hair loss patients.

Hair straightening changes hair structure and can cause damage if done wrong, but improvements in the methods are expected to continue.

Hair straightening methods have advanced to improve effectiveness and reduce damage, but still rely on heat and chemicals.

Frequent use of chemical hair relaxants is linked to increased scarring hair loss in Nigerian women.

Hair relaxers are linked to reduced cystine levels and potential hair damage.

Brazilian keratin treatments can straighten hair but may contain harmful formaldehyde.

Cholesterol balance is important for hair health, and problems with it can lead to hair loss conditions.

The document concludes that clinicians should be aware of common hair and scalp disorders in women of African descent and that more research is needed to develop effective treatments.

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

Hair health is influenced by genetics, aging, and environmental factors, with proper care needed to maintain it.

Recognizing specific features of African-American hair can help diagnose hair loss conditions.

White hair grows thicker and faster than black hair due to higher activity of growth-related genes and proteins.

The article concludes that the global hair trade is exploitative and reflects complex cultural and economic issues.

PDI helps restore over-bleached hair's strength and structure by attaching special peptides.

Common Black hair care products may affect hormone levels and potentially impact health, especially in reproductive and metabolic areas.

Removing external lipids from hair reduces moisture and increases strength, while removing internal lipids decreases water permeability.

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

Understanding hair biology is key to developing better treatments for hair and scalp issues.

The document concludes that periocular hair disorders have various causes and treatments, and proper evaluation by specialists is important for management and prognosis.

Yak belly hair has higher porosity and is less stiff than human hair, making it absorb dye better but less suitable as a direct substitute for hair dyeing.

Hair stiffness increased by 13.2% after caffeine treatment, validating the Stiffness-Angle Law as an effective measurement method.

Human hair shows promise for non-invasive medical testing, but more research is needed to standardize its use.

Avoid chemical and physical damage to protect hair.

Hair can't be reliably repaired once damaged; prevention and proper product use are key to maintaining hair health.

A young woman developed a bowel obstruction from eating hair from her weave to relieve anxiety.

Cosmetic procedures can harm hair, but damage can be minimized with knowledge and care; however, once hair is damaged, it cannot be reliably repaired.

Keratin hydrogels from human hair show promise for tissue engineering and regenerative medicine.

Environmental, chemical, mechanical, and personal health factors can all damage hair and contribute to hair loss or changes in hair quality.

The normal range for the hair pull test is 2 hairs or fewer, and washing or brushing hair before the test does not affect the results.