Final answer:
Deep treatments are hair care products that penetrate and reinforce the hair shaft, specifically the cortex, to temporarily reconstruct hair. Unlike simple rinses or hair dyes, these treatments are designed to address hair damage and restore strength.
Step-by-step explanation:
Products that are designed to penetrate the cortex and reinforce the hair shaft from within, which temporarily reconstruct the hair, are primarily known as deep treatments.
These treatments work by addressing damage to the hair structure, providing restoration and moisture to each strand. Hair consists of three main zones: the cuticle, cortex, and medulla, with the cortex being responsible for the strength and color of the hair.
Deep treatments often contain proteins and conditioning agents that penetrate and fortify the cortex, thus providing the reconstructive benefits.
Rinses are used as a form of temporary hair color but don't reconstruct the hair. On the other hand, plant-based dyes like henna and indigo, which are sometimes used in deep conditioning treatments, can also strengthen the hair shaft while imparting color.