There is no universal rule for determining the correct frequency of washing for all hair types, because where you live or lifestyle should also be taken into account.
An important role is also played by the climate, the use of the car, sports, water quality.
However, even when your hair is dry and seemingly clean for a few days, you should wash it at least twice a week to remove any residue that may build up on your scalp.
This is the result of a recent study published in "Jenny Gr". So if you wash your hair once a week, you should know that it's not such a good idea, so you need to change that. (A2 Televizion)
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