Oregon Cosmetology Certification Practice Exam 2025 - Free Cosmetology Certification Practice Questions and Study Guide

Over-processing hair with bleach can lead to damage, breakage, and loss of elasticity due to the harsh chemical nature of the bleaching agents. When hair is bleached, the cuticle layer is lifted to allow the bleach to penetrate and remove color. This process can strip the hair of its natural oils and proteins, which are essential for maintaining structural integrity and moisture. As a result, the hair becomes more porous, leading to increased brittleness and a high likelihood of breakage.

Furthermore, over-bleached hair can lose its elasticity, meaning it becomes less able to stretch and return to its original shape. This loss of resilience can leave the hair looking dull, frizzy, and unmanageable. Proper hair care and conditioning after such treatments are crucial to alleviate some of the damage; however, the initial over-processing significantly impacts the hair's overall health.

The other options may suggest benefits, but they do not apply in the context of over-processing with bleach, which is known for its damaging effects rather than improving the hair's condition.