Kybella is a non-surgical injectable treatment used to reduce fat beneath the chin, also known as "submental fullness" or a double chin. The active ingredient in Kybella is deoxycholic acid, a naturally occurring molecule in the body that helps break down and absorb dietary fat. When injected into the area under the chin, Kybella destroys fat cells, resulting in a more contoured jawline and slimmer appearance. Once the fat cells are destroyed, they cannot store or accumulate fat again, providing long-lasting results.