What does a "hair analysis" entail?

A "hair analysis" primarily involves examining the hair's condition, texture, and density. This is essential for determining the specific needs of the hair, such as identifying damage, evaluating its health, and planning appropriate treatments or services. Understanding the hair's characteristics helps hair professionals offer personalized recommendations and services for their clients.

While the other options touch on relevant aspects of hair care, they don't encompass the full scope of what a hair analysis typically entails. Applying different hair products is more about the application process rather than analysis. Checking for lice infestation and assessing the scalp for dandruff are specific diagnostic tasks that focus on certain conditions, rather than a comprehensive analysis of the hair itself. Thus, the correct answer reflects a broader, more holistic approach to understanding hair health and characteristics.