After a workout where you have produced sweat, you should wash your hair to remain hygienic. The same applies to other physical activity that has caused your hair to become dirty. However, to avoid damage to the hair, you should avoid using shampoo with every wash and use water on its own.
How often should men wash their hair?
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The same rules apply to men. 2-4 times a week is what is recommended, however, if you are using hair products, this can clog pores and reduce the amount of oil produced. Lack of oil can dry out and damage hair. Shampooing hair on a frequent basis is not likely to contribute to baldness.
How often should you wash your hair if you have dandruff?
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Most of the time, dandruff is caused by a dry scalp, so in theory, frequent washing is likely to make dandruff worse. However, infrequent washing can cause scalp itchiness, which can make dandruff worse. My advice would be to use a medicated anti-dandruff shampoo 2-3 times a week and rinse your hair with water 2-3 days a week to get rid of the flakes.
How often to wash hair for growth?
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The frequency that you wash hair is unlikely to have an impact on your hair growth. The only added benefit the heat drawn to the head, which can help to stimulate growth from follicles, but this can be done without a shower. In fact, harsh chemicals from certain shampoos and chlorine from shower heads may cause hair damage that can contribute to poor hair growth. Invest in a hypoallergenic or natural shampoo, and a shower filter (to reduce the chlorine levels in the water). Massage your scalp frequently, you can use a gentle comb to do this, and avoid heat from straighteners and hair dryers, as this can also damage hair follicles.