This technique consists in introducing PDO threads into selected skin areas using a very fine needle. The threads are made of 100% biodegradable polydioxanone which dissolves in the skin over 6 to 8 months. Clinical research shows that PDO threads stimulate the production of natural collagen and elastin, resulting in increased skin density and firmness. Consequently, areas where threads were inserted gain a visibly younger, healthier and fresher appearance. PDO threads lift the skin in the cheek area to help redefine facial contours.