Ace the 2026 PSI Barbering Exam – Snip, Style, and Success Awaits!

Choosing smoothness as the primary action of acidic solutions on hair is accurate because acidic pH levels can help to flatten the cuticle layer of the hair. The cuticle is the outermost layer of the hair shaft, and when it lies flat, it allows for a smoother, shinier appearance. This is often beneficial in hair care products, such as conditioners and some styling products, which utilize acid to promote sleekness and enhance the overall texture of the hair.

Acidic solutions can balance out alkaline effects from other products, and they are commonly used in hair treatments to improve the hair's overall condition. A reduction in frizz and a more polished look can be attributed to the action of these solutions, as they close the cuticle and promote light reflection.

While one could argue that acidic solutions may also contribute to other effects like drying or strengthening in specific contexts, the predominant and immediate effect related to enhancing the smoothness of the hair is what makes this choice the most fitting in this instance.