What does the keratin treatment do to the hair?

The keratin treatment is specifically designed to smooth and straighten the hair by infusing it with keratin, a natural protein that is a key structural component of hair. When this treatment is applied, it penetrates the hair shaft, filling in gaps and damaged areas, which helps to create a smoother, more manageable texture. The added protein strengthens the hair, reduces frizz, and helps it resist humidity, leading to a sleek and polished appearance.

This treatment does not primarily focus on adding volume, coloring the hair, or only enhancing shine. While it may have some secondary effects like reducing frizz, which can contribute to a shinier look, the main goal of a keratin treatment is to provide smoothing and straightening effects, making option B the accurate choice.