What is the main function of the cuticle in hair?

The main function of the cuticle in hair is to protect the inner structure. The cuticle consists of several overlapping layers of flat, scale-like cells that form a protective barrier around the hair shaft. This outer layer serves multiple purposes, including shielding the more delicate inner layers of the hair—such as the cortex and medulla—from environmental damage, mechanical wear, and chemical processes.

Additionally, a healthy cuticle is crucial for maintaining the hair's strength, shine, and overall integrity. When the cuticle is damaged, it can lead to issues such as split ends, dryness, and loss of color. By serving as the first line of defense, the cuticle plays a vital role in the longevity and health of the hair, making its protective function essential.

Other concepts such as color retention, texture creation, and moisture absorption are influenced by other components of the hair structure or external factors, but the primary responsibility of the cuticle is indeed to safeguard the inner hair structure.