Missouri Cosmetology Exam Practice 2025 – Complete Study Guide

Brittleness and split ends are key indicators of heat damage on hair. When hair is excessively exposed to high temperatures from styling tools like irons, blow dryers, or curling wands, the hair's cuticle (the outer protective layer) can become damaged. This leads to a loss of moisture and essential proteins, resulting in fragile strands that break easily. Consequently, the hair can develop split ends, where the hair shaft splits into two or more strands, a clear sign of distress.

In contrast, softness and a smooth texture often indicate healthy hair that has not suffered from heat damage. Increased elasticity, which refers to the hair's ability to stretch without breaking, is typically associated with healthy hair that's properly moisturized and protein-rich. Similarly, natural shine is a characteristic of well-nourished, healthy hair that reflects light adequately, often lacking in hair that has experienced significant heat damage.