New York State Barber Practice Exam

A keratin treatment is most effective for curly or frizzy hair because this type of hair often has a structure that is more prone to frizz and lacks smoothness. Keratin is a fibrous protein that occurs naturally in hair, and when applied through a treatment, it helps to fill in the gaps in the hair cuticle, making the hair smoother and more manageable. In curly or frizzy hair, keratin treatments can greatly reduce volume and frizz while adding shine and making the hair easier to style.

In contrast, while straight hair may benefit from smoothing, it typically does not struggle with frizz to the same extent as curly or frizzy hair. Fine hair can become weighed down by keratin treatments, which may not provide the desired results. Thick, straight hair may see some benefits, but it generally does not require the same level of smoothing that a keratin treatment provides to curly or frizzy hair. Thus, the treatment is specifically designed to address the challenges presented by more textured hair types.