Fix it now.Use a color-depositing glaze once a week to bring back richness.

(It works whether or not you color your hair.)

Prevent future harm.Deep-conditioning masks are like a wheatgrass shot for thirsty, damaged hair.

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Apply the mask once a week to sopping wet hair, then cover with a damp, hot towel.

Wait about 10 minutes, then rinse with cool water.

Style spoiler:Sun exposure

Your skin isn’t the only thing prone to UV damage.

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Rays thin hair so cuticles separate.

In extreme cases, the inner cortex cracks.

Fix it now.Moisture is crucial to strengthening shafts.

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Prevent future harm.UV rays are like vampires.

They mercilessly suck the elasticity out of your hair, making it weaker.

Cover up your style with a hat when outdoors.

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Also important: Treat hair as you would cashmere.

Gently wash with sulfate-free formulas.

(Harsh detergents can strip strands.)

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Prevent future harm.Three to-dos: (1) Before styling, apply a heat-protective product to damp hair.

(3) Use boar-bristle brushes; metal ones conduct warmth, torching hair, Kingsley says.

Fix it now.Cut your losses!

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Style spoiler:Rough combing

Teasing and vigorous brushing create tears on the cuticle.

Fix it now.Hot-oil treatments restore mirrorlike shine and fill in any crevices.

Leave on 30 minutes, then rinse.