Thread Lifting is a procedure in which PDO medical threads, which are gradually absorbed by the body, are inserted into the subcutaneous layer using a needle. The barbs on the thread surface catch the sagging tissue, pulling and fixing it in the desired direction, resulting in immediate lifting. As the threads dissolve, a mild foreign body reaction occurs around them, activating fibroblasts and forming new collagen along the thread paths. This method combines physical traction with tissue regeneration.