Washing removes, along with dirt, the natural oil from the hair - and no shampoo can restore it. Shampoo usually contain only soap or detergent, with added perfume:;a poor shampoo may contain a mild alkali such borax, which can irritate the scalp. Thick oily dressings tend to clog the opening of sweat glands and irritate the scalp; they should be avoided. If you are troubled with dandruff, wash your hair with a medicated shampoo; and if you have dry hair, massage a little olive oil into the scalp after shampooing.
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