Over the weekend, a reader e-mailed me because she's been losing her eyelashes. She used to have thick, full lashes, but more recently, they'd been falling out. After she explained her beauty routine, I immediately knew what was up. She was using an eyelash curler, but the way she used it was the culprit: She curled her lashes both before and after using mascara.

One of the easiest ways to make your eyes look bigger is to use an eyelash curler, but it's essential to curl your lashes only before applying mascara. (Here's how to use a curler.) If you curl after applying mascara, the curler will stick to the coated lashes. At worst, it breaks the lashes then and there; at best, it will weaken your lashes over time, making them more likely to fall out.

Fortunately, lashes grow back over time, and my reader friend will soon be back to her doe-eyed self. But to avoid lash loss in the first place, curl them only before slicking on your mascara.