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Plica neuropathica is a tangled hair condition that may be caused by hair damage or psychiatric issues and is treated by cutting the hair and addressing mental health.

Hair curvature in Japanese people is linked to specific cell types and filament arrangements in the hair cortex.

The study found specific proteins that could mark different growth stages of cashmere goat hair and may help improve cashmere production.

The herbal hair dye with natural ingredients like henna was successfully made and tested, but more research is needed on its effectiveness on different hair colors and benefits.

Thioglycolic acid and L-cysteine change hair structure differently during perms, affecting hair strength and curling efficiency.

Using both TGA and DTDG in hair straightening reduces hair damage compared to using TGA alone.

The dietary supplement helped increase hair growth in women with hair loss.

Permanent waving weakens hair by altering its protein structure.

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.

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

Human hair's ability to get wet is complex and can change with treatments, damage, and environment.

Hair analysis for drugs needs a better understanding of how drugs enter hair, considering factors like hair structure and pigmentation.

Hair treatments like bleaching increase friction by exposing tiny pores on the hair surface.

Hair treatments cause significant structural changes, especially with excessive heat, regardless of ethnicity.

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

Different tests are used to see how hair care products affect hair, and choosing the right test is important for accurate results.

Hair's structure and properties change with pH; acidic pH maintains strength and less swelling, while alkaline pH increases water content and swelling.

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

Cold waving solutions quickly reduce cystine to cysteine in hair.

Adding human hair to clayey soil makes it stronger, even after freeze-thaw cycles, and is eco-friendly and cheap.

Hair absorbs molecules differently based on their size, charge, and love for water, and less at higher pH; this can help make better hair products.

African hair has the most lipids, while Caucasian hair is more hydrated and stronger.

Angora goat hair grows faster and produces more protein than cashmere goat hair, and certain hormones and nutrients positively affect hair growth and protein synthesis.

Human hair structure varies by ethnicity, and certain treatments can improve hair condition and appearance.

Proper hair care and safe use of hair products are crucial for those with hair loss.

Understanding hair surface properties is key for effective hair care products.

Avoid chemical and physical damage to protect hair.

Natural plant-based substances can be used as effective hair dyes.

Twisting hair weakens it, but strength can be recovered at low twist levels.

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