Beauty is pain—or, in the case of Botox, beauty is temporary pain, followed by complete (muscle) relaxation. Each year, hundreds of thousands of women and men pay a visit to their derm and go under the needle in the name of smooth, wrinkle-less skin; in fact, Botox sales have soared past the $1 billion mark over the past decade. We’ve already covered the basics, but there are still quite a few things we were surprised to find out about the now-commonplace procedure. Like it’s somewhat sordid past, or the fact that it can help with depression, or your sweaty underarm problem. Curious? Keep scrolling for six weird, little-known facts about Botox you didn’t know!