Brazilian keratin treatment involves themally sealing Keratin into your hair with a flat iron. Keratin is a natural type of protein in your skin, hair, and should last up to three months depending on your hair type. Brazilian Keratin Treatment can be performed on every type of virgin or chemically treated hair. The treatment is gentle enough to use on all hair types: color treated, chemically processed, bleached or highlighted. It is ideal for mistreated, unhealthy, and very damaged hair.