Avoid washing your hair every day, as this removes natural sebum, dries out the scalp (causing itching and a compensatory overproduction of oil), and weakens the hair fiber.

noli's read

The idea of adapting washing frequency to one's hair type is validated by experts at the American Academy of Dermatology (AAD). However, presenting daily washing as a universal bad habit is scientifically contradicted. A landmark clinical study conducted by Punyani and his team (2021) shows that washing hair 5 to 6 times per week actually offers the best scalp health and prevents itching. This research proves that frequent washing with an appropriate product does not alter the internal lipids of the hair fiber. Finally, the argument of the rebound effect—where the scalp supposedly overproduces sebum to compensate for washing—is considered a myth by specialists, as oil production is primarily dictated by genetics and hormones. Excessively spacing out shampoos can even lead to the accumulation of impurities that are harmful to hair vitality.

the sources

No named source held this one up — that absence is part of the verdict.