Wet hair really is more fragile than dry hair, and the reason is a measurable disruption of the hydrogen bonds holding keratin protein chains together. Here is the actual physics behind why this happens.
I brushed my wet hair with a paddle brush every day for years, right when it was most fragile. A hairstylist's one question connected years of hairline breakage to a habit I'd never questioned.
The right hair tool can transform your routine. The wrong one damages your hair for months. Here's the complete guide to heat styling science and the 7 best hair tools of 2026.