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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.

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

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

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

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

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

Infrared and Raman imaging can non-destructively analyze hair structure and help diagnose hair conditions.

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

Permanent waving weakens hair by altering its protein structure.

The research found two types of calcium in human hair, one that varies among individuals and another that is consistent across people.

TGase 3 helps build hair structure by forming strong bonds between proteins.

Pollution exposure speeds up hair damage.

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

Heat damages hair, with Asian hair losing more protein than Caucasian hair.

A dark-haired Chinese girl had hair that looked banded under certain light but was normal under a microscope.

The torsional method effectively evaluates hair damage and the performance of hair care ingredients.

Understanding how keratin structures in hair are arranged and interact is key for creating methods to extract and purify them.

Repeated dyeing and shampooing cause hair color loss and damage.

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

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

Water quality affects mineral content in hair, and coconut oil can protect against damage.

The research found that people's hair proteins vary, especially by ethnicity and body part, which could help identify individuals in forensic science.

The research found that people's hair proteins vary by individual and body part, with some differences between ethnic groups, which could help in forensics.

Surfactants damage hair, but sealing the cuticle can prevent this.

Human hair proteins vary by individual, body site, and ethnicity, useful for forensics.

Eyelash curvature is linked to the thickness of the cuticle layer at the root.

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

Keratin 33A is a key protein in goat winter coats, especially in high-producing breeds.

The enzymatic method can effectively identify chemical treatments on hair.

A small molecule can strengthen fine hair, making it more resistant and natural-feeling.