Verdict: FALSE.
The scalp has its own rhythm
The scalp renews itself naturally. Usually, dead cells shed gradually and invisibly.
When this renewal accelerates, the cells arrive at the surface in packets and become visible: these are dandruff. The renewal cycle can be reduced from around 28 days to just 5 to 14 days.
Washing too much can even cause the problem
So dandruff isn’t just a matter of cleanliness.
Seborrheic dermatitis, scalp psoriasis or simple dryness may in particular be to blame. Hormonal variations, cold, dry air, pollution or certain poor hair practices can also promote their appearance.
The document cites in particular excessively detergent shampoos, too frequent or insufficient washing, as well as excessive use of a hair dryer among the factors likely to disrupt the balance of the scalp.
When should you consult?
Intense itching, persistent redness or extension of the lesions towards the forehead or neck should alert you. Consult a dermatologist when the problem persists for more than a month.
What to remember
Having dandruff doesn’t mean you don’t wash your hair enough. Their origin may be linked to skin renewal, scalp disease, hormones, the environment or hair habits.
Doctor Kierzek’s advice:
It is recommended to use shampoos with zinc pyrithione, selenium sulfide or ketoconazole, twice a week. Beyond that, excess irritates the scalp. Avoid very hot water and a hairdryer on full power. If red patches spread to the face, it is advisable to consult a dermatologist.