Keratin works by smoothing down the cells that overlap to form your hair strands. The layers of cells, called the hair cuticle, theoretically absorb the keratin, resulting in hair that looks full and glossy. Keratin also makes curly hair less frizzy, easier to style, and straighter in appearance
keratin treatments use heat to bond keratin proteins to the hair to make it smoother and straighter. Results last around three months, and treatments can cost between $350 and $400.