Kybella is a natural substance that dissolves fat in your body and double chin. Once injected, Kybella attacks fat cells’ membranes, liquefying them so the body can absorb them. It’s generally used to get rid of double chins, also known as sub-mental fat or sub-mental fullness. While some people can reduce their double chins through exercise and changing their diet, others have double chins due to genetics. In such a case, you may want to try Kybella to reduce your double chin.