Which type of hair is most commonly treated with keratin treatments?

Keratin treatments are designed to smooth and strengthen the hair by infusing it with keratin, a protein that is naturally found in hair. The type of hair that most commonly benefits from keratin treatments is curly, frizzy, or damaged hair. These hair types often exhibit dryness and a lack of smoothness, making them ideal candidates for the restorative effects of keratin.

Curly and frizzy hair typically has more porous cuticles, which can lead to higher levels of frizz and difficulty in styling. Keratin treatments help to seal the cuticles, providing a protective layer that reduces frizz and enhances shine. This treatment also makes the hair easier to manage and style, leading to a smoother overall look.

While straight hair can benefit from keratin treatments for added shine and a sleek finish, it does not require the same level of transformation as curly or frizzy hair. Wavy hair may also benefit, but again, the dramatic smoothing effects of keratin are most pronounced in those whose hair is more unruly or damaged. Therefore, the effectiveness and common application of keratin treatments are primarily aimed at curly, frizzy, or damaged hair, making it the correct choice.