Which product is typically used for deep conditioning treatments?

The correct choice is a hair mask, as it is specifically formulated for deep conditioning treatments. Hair masks contain a concentrated blend of ingredients, such as oils, proteins, and moisturizers, that penetrate deeply into the hair shaft. This helps to repair, nourish, and hydrate the hair, making it smoother, shinier, and more manageable.

Hair masks are usually intended to be left on the hair for a longer period of time compared to regular conditioners, allowing their beneficial ingredients to work more effectively. Utilizing a hair mask can significantly improve the health of dry, damaged, or color-treated hair, making it a popular choice in salon and at-home treatments for deep conditioning.

In contrast, moisturizing shampoos are primarily designed to cleanse the hair while providing some moisture, but they do not offer the focused, intensive treatment that a hair mask provides. Hair gel is used to style hair and does not contribute to conditioning it. Leave-in conditioners provide light conditioning and moisture to the hair for everyday use but do not deliver the same level of deep conditioning benefits as a hair mask.