A keratin treatment is a hair treatment that involves the use of a keratin protein to smooth and straighten the hair. Keratin is a natural protein that is found in hair, nails, and skin, and is responsible for maintaining the strength and structure of these tissues. During a keratin treatment, a keratin solution is applied to the hair, and the hair is then blow-dried and flat-ironed to seal the keratin into the hair shaft. The keratin forms a protective layer around the hair, smoothing the cuticle and reducing frizz, leaving the hair looking shinier, smoother, and healthier. Keratin treatments can be used on all hair types, but they are particularly effective on hair that is damaged, frizzy, or curly. The treatment can also help to strengthen the hair, making it less prone to breakage and damage. It is important to note that some keratin treatments contain formaldehyde, a potentially harmful chemical that has been linked to health issues. Formaldehyde-free keratin treatments are available and are considered to be safer, although they may not be as long-lasting as formaldehyde-based treatments.