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Hair product allergies are common, especially to hair dyes, and hairdressers are at higher risk.

Direct heat perms cause more damage to hair than softening heat perms.

Microfibrils are key for permanent waves, and hydrolyzed keratin improves wave formation and hair condition.

The document explains how shampoos clean, rinses condition, one-step shampoos offer convenience, and hair growth promoters aim to prevent hair loss, emphasizing the importance of scientific evidence for their effectiveness.

The document concludes that proper diagnosis and treatment of hair shaft disorders require understanding their unique causes and avoiding hair-damaging practices.

Hair damage shows as fragility, dullness, and discoloration, varies by ethnicity, and is worsened by cosmetic procedures and diseases.

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

The nutritional supplement improved hair density and reduced hair loss in women with female pattern hair loss.

Using bacitracin zinc and selenium sulfide one after the other can temporarily turn white hair yellow.

Non-ionic silicone emulsion best protects hair color from sunlight.

Nanomaterials can improve hair care products and treatments, including hair loss and alopecia, by enhancing stability and safety, and allowing controlled release of compounds, but their safety in cosmetics needs more understanding.

Cationic and nonionic surfactants provide better color intensity and resistance for semi-permanent hair dye than anionic surfactants.

Polydopamine is a safe, effective, and permanent hair dye that turns gray hair black in one hour.

A new hair treatment using a natural polyphenol complex improves hair strength, reduces static, and protects against UV damage.

Homemade hair treatments can significantly lower drug levels in hair, possibly causing false-negative drug tests.

Using enzymes to link proteins makes hair repair treatments more effective and long-lasting.

Hair cystine levels may indicate protein malnutrition, but more research is needed.

Child abuse is linked to higher BMI, but not because of hair cortisol or cortisone levels.

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

We need better treatments for hair loss, and while test-tube methods are helpful, they can't fully replace animal tests for evaluating new hair growth treatments.

Grape seed oil improved hair quality the most, followed by rosehip and safflower seed oils, and reduced damage from shampoo.

The review suggests a comprehensive approach to treat hirsutism, focusing on hair removal, medication, and managing emotional effects.

Chemical hair straighteners can cause scalp and hair damage, but long-term effects are unclear.

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

Human hair strength and health are linked to sulfur compounds that can be reduced by stress but improved with sulfur supplements.

Plant extracts may help prevent or reverse hair graying.

Sex hormones affect hair growth and loss, and treatments for related hair diseases include various medications, hair transplantation, and light therapy.

Laser treatment may help with hair growth in some people with frontal fibrosing alopecia, but results vary and the exact way it works is unclear.

Human hair keratin fibers have a detailed nano-scale structure that changes with different conditions.

Future hair products will use ecofriendly proteins and peptides to improve hair health and appearance.