When performing a haircut, the comb’s angle should be aligned with what?

The correct answer is that the comb’s angle should be aligned with the curvature of the head. In haircutting, achieving a balanced and natural look is vital, and aligning the comb with the head’s curvature allows for a more accurate cut that adapts to the client's head shape. This technique not only ensures that the haircut conforms well to the contours of the head but also helps in creating a seamless blend in layered styles or graduated cuts.

In contrast, aligning the comb with the length of the hair may lead to uneven results, particularly because different sections of hair may fall differently based on the head's shape. Focusing on the shoulder line or the hairline may provide limited guidance by not considering how the entire head curves, which is crucial for a flattering and proportionate haircut. Hence, prioritizing the curvature of the head ensures a more skilled and professional outcome in the haircutting process.