You’ve probably been told at least a hundred times not to brush your hair when it’s wet. But the minute you emerge from a shower, there you go, dragging a brush through your hair and undoubtedly breaking and fraying strands in the process. Javon Ford, a cosmetic chemist, tells us how to tend to our hair without losing our minds.

The science says that your hair is most vulnerable—no matter what your hair type—when it’s wet because the hydrogen bonds are temporarily broken. That’s why you’re not supposed to sleep with wet hair.