Milady Cosmetology Practice Exam 2026 – All-in-One Guide to Master Your Cosmetology Certification!

The correct answer is permanent waving or relaxing because these services involve altering the internal structure of the hair. Permanent waving involves the process of breaking and reforming the disulfide bonds in the hair, which allows for the creation of curls or waves. This change is permanent until new hair growth occurs. Similarly, relaxing involves the use of chemical agents to break down the natural curl pattern of the hair, making it straighter and smoother.

In contrast, while scalp treatments, deep conditioning, and coloring may have beneficial effects on the hair, they do not fundamentally alter the hair's structure. Scalp treatments focus on the health of the scalp and hair follicles, promoting a healthy environment for hair growth without changing the hair's physical properties. Deep conditioning treatments are intended to nourish and hydrate the hair, improving its appearance and manageability, but they do not change the hair's chemical structure. Coloring hair involves applying pigments that alter its appearance but does not affect the inherent structure of the hair itself in a permanent way.