Keratin Keratin hair treatments are a cosmetic procedure that involves applying a keratin protein solution to the hair. This are a cosmetic procedure that involves applying a keratin protein solution to the hair. This solution is then heated to a high temperature, usually with a straightener, to seal the keratin into the hair shaft. The result is hair that looks smoother, shinier and less frizzy. Keratin treatments can last up to 3 months, depending on the type of product used and the person's hair type
,