South Dakota Cosmetology Practice Exam

The pH scale is significant in hair care because it measures the acidity or alkalinity of hair products, which directly affects the hair's cuticle and overall health. Hair and scalp have a natural pH level that ranges from 4.5 to 5.5, which is slightly acidic. Products that fall within this range can help maintain the integrity of the hair cuticle, promoting a healthy sheen and preventing damage.

When hair care products have too high a pH (alkaline), they can cause the hair cuticle to raise, leading to tangling, frizz, and increased susceptibility to damage. Conversely, products with low pH can help in closing the cuticle, resulting in smoother hair that is less prone to brittleness and breakage. Understanding the pH of hair products allows cosmetologists to choose appropriate products for their clients based on their hair type and condition, ultimately contributing to better hair health and appearance.