PDO (polydioxanone) Threads are a safe and effective non-surgical procedure that is an alternative for patients who desire lifting and /or tightening of saggy skin but are not quite ready for a facelift. It is used on sagging or crepey skin on the face, neck and jawline but can also be used in different areas of the body, including arms, knees and buttocks. In the past, “Thread Lifts” involved surgery and were performed with different materials which were permanent and led to undesirable side effects such as infections and thread breakage.