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A keratin treatment smooths the hair and keeps frizz down for a few weeks — it does not change the structure permanently, and the effect washes out over time. The appointment is long: the product is applied, dried off and pressed section by section. The first days come with their own washing rules.
Anywhere from a few weeks to a few months, depending on the product, your hair and how often you wash it. The salon will say what to expect with your hair and when it is worth repeating.
Salons usually ask you not to wash it for the first few days, to avoid tight ties and damp, and then to use sulphate-free shampoo. The exact aftercare depends on the product used and you will get it at the appointment.