South Carolina Cosmetology Practice Exam

The primary purpose of using a serum in hair care is to enhance shine and control frizz. Serums are typically formulated with silicone or oils which coat the hair shaft, smoothing the cuticle and providing a protective layer. This helps to improve the overall appearance of the hair by making it look shinier and healthier. Additionally, the smoothing effect of serums helps to tame frizz, making hair more manageable, especially in humid conditions.

Other options, while relevant to different hair products or treatments, do not encapsulate the main function of a hair serum. For instance, products meant to add volume might focus on creating lift at the roots or expanding the hair fibers, which is not the core purpose of serums. Similarly, products that provide hold for styles are designed to create texture and support a given style, which is distinct from the shine and frizz control that serums offer. Lastly, while some serums may provide a limited degree of protection from heat styling tools, this is not their primary function; other products, such as heat protectants, are specifically formulated for that purpose.