What does ionic technology actually do in a hair dryer?

Ionic technology generates negative ions that break down positively charged water molecules on your hair into smaller droplets. This means water evaporates faster, so you spend less time with heat on your hair. As a bonus, the negative ions also smooth the hair cuticle, reducing frizz and static. The difference is most noticeable on thick, frizzy, or coarse hair. If you have fine, straight hair, you may notice less dramatic improvement but will still benefit from faster drying.