Hair keeps the shape in which it cools down. This is why flat irons can turn unruly curls into shiny straight strands of hair and why a curling iron can give volume to limp hair without volumizing products or hair mousse. Heat styling can however become a problem for your hair. Styling devices can reach temperatures up to 220°C (428°F) and cause micro-fine damage to wet unprotected hair.
The long-term consequences of unaided heat treatments are split ends, lack of luster and breakage. This can be avoided by applying protective products before any heat styling. These products make styling easier and prevent topical overheating. Equally important is the choice of the styling device. Newer flat irons have special coatings (e.g. ceramic coatings), which ensure even and moderate heating of the hair.