Milady Cosmetology Practice Exam 2026 – All-in-One Guide to Master Your Cosmetology Certification!

Using too much heat on hair often leads to reduced shine. When hair is exposed to excessive heat, the cuticle layer, which is the outermost protective layer of the hair, can become damaged. This damage makes it harder for the hair to reflect light properly, resulting in a dull appearance and lack of shine. Overheating can also cause the hair to lose moisture, further contributing to the lack of luster.

The other potential effects of heat, such as increased elasticity, strengthened strands, and improved texture, may seem appealing; however, the reality is that high heat can weaken hair structure, making it more prone to breakage and frizz, which ultimately degrades its overall condition and appearance. Thus, while some might think that heat could enhance hair features, too much heat typically does the opposite, particularly when it comes to maintaining shine.