South Dakota Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The primary role of shampoo in hair care is to cleanse both the hair and scalp. Shampoos are formulated to remove dirt, oil, sweat, and product buildup, ensuring that the hair remains clean and healthy. This cleansing action is essential because it keeps the scalp free from excess sebum, which can lead to issues such as dandruff and blocked hair follicles. By removing these impurities, shampoo not only enhances the overall appearance of the hair but also prepares it for further treatment, whether that involves conditioning or styling products.

While options regarding adding color, providing volume, or protecting against heat damage are related to hair care, they do not accurately describe the fundamental purpose of shampoo. Shampoos are distinct from hair dyes, volumizing products, and heat protectants, which serve different specific functions in the hair care routine. Thus, the focus of shampoo is fundamentally on cleansing, making it the most appropriate choice in this context.