</p><img src="https://media.istockphoto.com/id/1202036360/de/foto/ersatzteile.jpg?b=1&s=170x170&k=20&c=mnVPxqO0aMyRb0ojyQKM2CAdLrnJGnnoAxCZuNoHtNU="><br/><p>Hair’s ability to withstand stress arises from the interplay between its internal architecture, chemical bonds, and surrounding conditions<br/></p><br/><p>Embedded within every strand, the cortex forms the primary structural core, built from bundled keratin polypeptides<br/></p><br/><p>The structural integrity of keratin relies on a network of covalent disulfide links, reversible hydrogen interactions, and electrostatic salt bridges<br/></p><br/><p>These covalent sulfur-sulfur connections act as the main anchor points, granting hair its toughness and ability to rebound after stress<br/></p><br/><p>Surrounding the cortex is the cuticle—a layered, shingle-like barrier designed to defend the inner hair structure<br/></p><br/><p>Made of flattened, keratinized cells, the cuticle’s layered design blocks moisture loss and physical trauma<br/></p><br/><p>When these scales lie flat and intact, the hair feels smooth and looks shiny<br/></p><br/><p>Exposure to high temperatures, harsh detergents, or aggressive brushing can lift or erode the cuticle, exposing the cortex and increasing fragility<br/></p><br/><p>Frequent coloring, blow-drying, or flat-ironing accelerates cuticle degradation, significantly reducing tensile strength<br/></p><br/><p>Water interacts dynamically with hair’s internal structure, influencing both flexibility and vulnerability<br/></p><br/><p>This hygroscopic property allows hair to swell, altering its internal tension and bond configuration<br/></p><br/><p>As water molecules penetrate, they disrupt the delicate hydrogen bonding network essential for maintaining keratin’s folded shape<br/></p><br/><p>That’s why wet hair is more fragile than dry hair and should be handled gently<br/></p><br/><p>This repeated expansion and contraction gradually degrades structural cohesion, contributing to long-term brittleness<br/></p><br/><p>Your inherited traits dictate the baseline diameter, number of follicles, and cortical density of your hair<br/></p><br/><p>Some people naturally have thicker hair strands with more cuticle layers and a denser cortex, making their hair more resistant to breakage<br/></p><br/><p>Nutritional intake directly fuels the production and maintenance of healthy <a href="http://apms.jaea.net/bbs/board.php?bo_table=free&wr_id=211862">China Hair Extension Manufacturer</a><br/></p><br/><p>Deficiencies in any of these can impair the hair’s ability to regenerate and maintain strength<br/></p><br/><p>Deficiencies in these can lead to brittle, thinning hair<br/></p><br/><p>These external assaultors accelerate aging and weaken the hair’s natural defense system<br/></p><br/><p>The loss of ceramides and fatty acids in the cuticle leaves strands vulnerable to mechanical and chemical damage<br/></p><br/><p>Limiting sun exposure, avoiding chlorine-heavy pools, and using filtered water for rinsing preserve structural integrity<br/></p><br/><p>In summary, hair strength comes from the complex interplay of protein structure, protective layers, moisture balance, nutrition, and external care<br/></p><br/><p>By recognizing how structure, environment, and nutrition interact, you can tailor your routine to preserve strengt

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