What are PDO threads PDO thread, which is a thread without a taper and therefore does not damage tissue. This is the same suture used in heart surgery and other procedures, so it is very safe. The thread is implanted into the subcutaneous skin and stimulates the production of collagen, the skin becomes firmer, elastic and moisturized. The threads will dissolve on their own within a few months, but the effects will last for 18-24 months. The thread can be used on any part of the body such as sagging face, cheeks, eyebrows to prevent bags under the eyes, sagging neck skin, fine lines, wrinkles and bust lift.