Keratin treatments are hair smoothing procedures that use a protein called keratin to reduce frizz and enhance shine. These treatments work by infusing the hair with keratin, which helps to fill in gaps in the hair cuticle, making it smoother and more manageable. The results can last several weeks, depending on the hair type and aftercare. During a keratin treatment, a stylist typically applies a keratin solution to the hair, followed by heat from a flat iron to seal the product in. While these treatments can improve the appearance of hair, they may contain formaldehyde or other chemicals, so it's important to choose a reputable salon and discuss any concerns with the stylist.