Pivot Point Cosmetology 108 – Long Hair Design Practice Test

Porosity describes how open the hair cuticle is and how it responds to moisture and styling products. After thermal styling, finishing depends on how well the cuticle smooths down and how long moisture and product stay in the hair. Hair with high porosity has raised or damaged cuticles that accept moisture and products quickly but also lose them quickly, which can leave the finish dull, frizzy, and prone to slipping or losing hold. A sealing product helps smooth the cuticle, lock in moisture, and form a barrier against humidity, improving both shine and the durability of the style. Because of this, high-porosity hair often benefits from sealants or silicone-based serums to achieve a longer-lasting, more polished finish. Porosity does influence finishing, and it's not limited to color or scalp irritation, so other statements don’t explain why the finish behaves the way it does after heat styling.