Causes
Sun, wind, and dry air pull moisture out of hair the same way they do skin. Chlorine and salt water cause the same effect with every unprotected swim, and cold, dry winter air does it gradually, without an obvious trigger like a day at the beach.
For hair that's already prone to dryness, shampooing too often, especially with sulfate-based formulas, can strip away moisture along with dirt and buildup. Blow-drying on high heat, flat irons, and curling irons raise the hair shaft's temperature past the point where its structure holds up, breaking down the protein that keeps moisture locked in. Coloring, bleaching, and chemical treatments break that same structure open on purpose, which is why treated hair is almost always drier afterward.
Brushing hair while it's wet, when it's weakest, causes breakage. Rubbing hair roughly with a towel creates friction against the cuticle, the layer responsible for sealing in moisture. Tight ponytails, braids, and extensions put ongoing tension on the hair shaft, and rough pillowcase fabric adds friction every night.
Curly and textured hair is often naturally drier due to its texture and natural porosity.
If dryness persists no matter what changes you make, it's worth a conversation with your doctor.
Treatment
Restoring dry hair means addressing protein and moisture together, not one instead of the other. A hydrating treatment adds back moisture that's already been lost, and a protein treatment, done every few weeks, rebuilds the structure that holds that moisture in place. Both matter, especially for hair that's colored, heat-styled, or chemically treated.
Prevention
Shampooing less often, if your hair is already dry-prone, helps preserve the moisture it has. A sulfate-free formula and conditioning every time you shampoo prevent further stripping. Detangle before shampooing rather than after, when hair is most fragile, and blot hair dry with a towel instead of rubbing it. Air-dry when you can instead of reaching for heat by default, and swap a cotton pillowcase for silk or satin to cut down on overnight friction. Protect hair from the sun and water the same way you'd protect your skin: a hat outdoors, a swim cap in the pool or ocean.
The Bottom Line
Dry hair is rarely permanent. It's a pattern of small, repeated habits, which means it can change the same way: gradually, with small, repeated changes. If dryness doesn't respond to those changes, that's the moment to see your doctor instead of continuing to guess.
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