South Dakota Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

The exterior hair structure can be determined by examining the cuticle layer for texture and condition. The cuticle is the outermost layer of the hair shaft and plays a crucial role in its overall health and appearance. By analyzing the cuticle, one can assess how well the hair is protected and its susceptibility to damage. Characteristics such as the smoothness or roughness of the cuticle, whether the scales lie flat or are lifted, and the level of moisture can provide valuable insights into the hair’s condition and health.

Other methods, such as observing hair color or shine, do not provide as specific information about the structure. While the shine of the hair can indicate its overall health, it may also be influenced by external factors such as products used or environmental conditions. Smelling the hair is not a relevant method for determining its structure and doesn't yield any specific information about the physical characteristics of the hair itself.