Minnesota Cosmetology State Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

A blow dryer exerts heat on the hair, which impacts the hair structure, particularly the cuticle, which is the outermost layer of the hair shaft. When heat is applied, especially if it is excessive or used improperly, it causes the hair cuticle to lift. This lifting can lead to increased porosity, making the hair more susceptible to damage and frizz.

As the cuticle lifts, it can disrupt the hair's smoothness, leading to potential issues with moisture retention and overall hair health. Understanding this effect is crucial for cosmetologists, as it influences how they style hair and the products they may recommend to protect against heat damage.

In contrast, while a blow dryer can improve the appearance of hair temporarily by providing styles with volume and shape, it does not strengthen the hair shaft or thicken the strands. Additionally, it does not moisturize the hair cuticle; rather, it can contribute to drying out the hair if not used with care or coupled with appropriate moisturizing products.