If you have dark circles under your eyes, you’ve undoubtedly tried every brightening cream out there to no avail. But the truth is that undereye filler is one of the few things that can actually change their appearance for real, depending on what’s causing your dark circles.

But before you pursue a procedure like this, it’s important to know what it actually is and what you can really expect from it. So, here’s what you should know before getting undereye fillers.