What is the main purpose of using a deep conditioner?

The main purpose of using a deep conditioner is to moisturize and repair damaged hair. Deep conditioners are formulated with rich emollients and proteins that penetrate the hair shaft more effectively than regular conditioners. This deep penetration allows them to address issues such as dryness, frizz, and brittleness, making them particularly beneficial for hair that has been subjected to chemical treatments, heat styling, or environmental stresses.

While deep conditioners can contribute to shine and may enhance the overall appearance of the hair, their primary function is focused on restoring moisture and repairing the damaged structure of the hair. This repairing process helps to improve the hair's elasticity and strength, ultimately leading to a healthier look and feel. The other options address benefits that, although valuable, are not the core reason for using deep conditioners.