Along with Botox and fillers, there’s another buzzy treatment gaining popularity: smooth threads. The minimally invasive treatment—which Duchess Fergie opened up about trying—adds volume under the skin to tighten sagging, smooth fine lines and wrinkles, and strengthen the skin overall.

There’s little to no downtime and it’s (nearly) pain-free. Sound too good to be true? We tapped an expert to find out everything there is to know about the trending treatment.