How To: Keratin Treatment For Hair Thickening

Hair damage is more than just split ends. Extremely damaged hair develops cracks in the outside layer (cuticle). Once the cuticle lifts (opens), your hair is at risk for further damage and breakage. It may also look dull or frizzy and be difficult to manage. Keratin is an important structural protein, and it can certainly help with hair thickness. However, it must be taken in correctly.