The way you care for human hair extensions is not much different from the way you care for your own hair. Just keep in mind that they need extra nourishment and extra care as they have been color treated and can no longer get nourishment and hydration from roots unlike our growing hair on scalp. So,
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Always brush your hair extensions gently with fingers or a soft bristle wide-tooth brush before and after use.
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Lightly wash them infrequently, or after every 10-20 wears, or when they get too tangled and frizzy, or when there is much built up and they become unmanageable to style.
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Wash in lukewarm water, then apply a small amount of shampoo. Rinse out the shampoo and apply a conditioner for 4-5 minutes. Rinse thoroughly. Allow to air dry.
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Always use a heat-protecting spray when using hot tools such as flat irons and curling irons (temperature not set over 350ºF). A regular cloth-use iron is also ideal to iron hair if the temperature is set between “silk” and “wool” without steam.
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Use moisturizing and repairing shampoos, conditioners or leave in creams (particularly for color treated hair, e.g., Moroccanoil, sleek-serum CHI, Osis, etc.)
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While generally we don’t recommend to re-color/dye the hair especially bleaching it, you may mildly make the hair darker or alter its color with a professional brand of dye and a 10-volume peroxide that deposits color only.