Oregon Cosmetology State Board – Hair Practice Test

The primary function of the cuticle layer is to protect the inner layers of the hair. The cuticle, which is the outermost layer of the hair shaft, is composed of overlapping, thin, flat cells that create a barrier. This barrier plays a crucial role in safeguarding the more vulnerable inner layers of the hair, such as the cortex, which contains the pigment and keratin that give hair its strength and color.

By providing this protective layer, the cuticle helps to shield the hair from environmental damage, such as UV rays, heat, and chemical treatments that can lead to breakage or alterations in texture. Maintaining the integrity of the cuticle is essential for the overall health of the hair, ensuring that it retains its strength and resilience over time.