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It is wild to me that regularly washing is seen as controversial just because it's the scalp and not ... say.... hands.
More so if the hair is curly.
More so if the skin is melenated.
Just wild.
Lifestyle dictates routine. Wash when before your scalp gets itchy or more frequently if it gets sweaty or oily.
Scalp produces oil (sebum), oil traps dirt, debris, dead skin, etc and becomes waxy.
Remove it regularly to prevent infections that lead to fungi that lead to hairloss