Facial submerged thread lifting to restore youthfulness is not a new thing, and has been used for nearly forty years until now. The materials used have also evolved from non-absorbable threads to absorbable threads, and the indications have gradually expanded while safeguarding the results, making the clinical application safer, less traumatic, and quicker to recover. It is getting hotter and hotter in the cosmetic industry today. Well, the current line quality according to the main components can be divided into two kinds, one is PDO or PPDO line, the former is to dioxane, the latter is to dioxane polymer, this composition is biocompatible, strong resistance to infection, anti-tensor force, after about half a year will be gradually absorbed. There are mainly the current domestic Hang Seng line and the American Quill line. Another kind is V-Loc thread, the composition of which is glycolic acid and propylene-carbonate copolymer, which is also absorbable. This kind of thread is a commonly used clinical wound suture. Then it can be divided into smooth thread and thread with teeth according to whether or not it has a sear. Smooth threads are mainly used for filling, whitening, and blemish reduction. Toothed threads are mainly used for lifting. I will start with the general knowledge of the toothed threads. The principle of pulling the buried line with teeth: I summarized, the principle of pulling the line with teeth can be roughly divided into two aspects. 1, mechanical lifting effect: with teeth line has a lot of barbs like fish hooks, when placed into the subcutaneous tissue of the face, these small teeth hang subcutaneous tissue and fascia, up and out of the tightening line, it drives the sagging skin, subcutaneous tissue outward tightening, at this time, we can tighten the line fixed in the temporal, behind the ear subcutaneous tougher fascia, maintain a lift tight skin state. Therefore, the threads must be anchored and fixed (e.g., by tying knots and sutures) in the upper part, such as in the temple hairline and in the mastoid area behind the ear, in order to maintain good results. If not fixed, after the line is placed, the upper end is not anchored and will gradually slip off with gravity, running to the corner of the mouth, jaw edge, etc. Some of the lower end even tops the skin, forming a small package. 2, biological lifting effect: we know that the composition of the line is to dioxane or has been diol acid, etc., placed under the skin, equivalent to a foreign body, will inevitably awaken the body repair function, stimulate the skin fibroblasts, subcutaneous fat cells and some inflammatory cells, secrete collagen and various growth factors, to achieve self-renewal and differentiation, produce new collagen, the formation of collagen fibers around the line, when these When these absorbable threads are completely degraded by the body’s enzymes (the degraded components are CO2 and water, no other components remain, which is also a good safety point), the later lifting effect is maintained by these formed collagen bands. This is why it is said that a buried lift can last for a long time. Of course, from the above discussion, we can also see that the buried threads can stimulate collagen growth and growth factor secretion activities, so it has the effect of increasing skin quality and lightening spots at the same time. However, the lifting threads are usually buried deeper and not close to the dermis, so this effect is relatively weak. On the contrary, smoothing threads are mostly buried under the dermis (under the muscles of thin skin areas such as the eyelids), and its effect of spot reduction, skin whitening and rejuvenation, and dark circle removal is more obvious. Of course, there is no lifting effect of smoothing threads. From my introduction, you can understand that the lifting effect is guaranteed. So, below, let’s talk about the safety issue. 1, completely absorbed without residue: this point has been mentioned above, now the absorbable line is completely degradable in the body, no toxic side effects. This is very important, in addition to many people’s worries. Because beauty is not a necessity for a significant portion of the population, so safety is the first consideration. 2.Operation safety: The above mentioned the safety of the wire itself. Then the safety of the operation is basically related to the operation of the doctor. In fact, now more and more people do buried wire, there are many problems, but I can see that the main problem is the operation of the surgery has problems. For example, the sterilization is not strict, irregular, resulting in infection and pus. The level of the buried thread is not correct. Too shallow is close to the dermis, it will lead to unevenness, the tighter the line is pulled the more obvious, the short-term post-operative aesthetic, but after a period of time will recover. If it is too deep, the lifting effect will not be obvious. The most important thing is that the skin is the most active, especially for those who are particularly lax, and deeper down, the subcutaneous muscle tendon system is what we often call the SMAS layer, which is also active, especially in the lower part of the middle, but obviously smaller than the skin, and in some places the SMAS can’t be lifted at all. Going deeper, the soft tissue near the facial skull basically has zero mobility. So, in general, the thread with teeth is buried in the subcutaneous fat layer, a little deeper if the thread is thick and a little shallower if it is thin. The threads slip out later. As mentioned above, if the dentate threads are not anchored, they will sooner or later slip out of place, as a result of gravity and expression muscle activity. If the wire goes down to the shallow side, it will hit the skin, and to the deep side, it will hit the oral mucosa, and the tongue will lick it. In addition, there are other problems such as bilateral asymmetry, hematoma, bruising, etc., which I will write a special article about later. A good buried wire surgery should take about 30-40 minutes to complete the recovery process, have immediate results, be bilateral and symmetrical, have no hematoma or bruising, not affect the opening of the mouth, and be able to go to work after resting for a while. If you can achieve these few things, you can be considered successful. With teeth lift line applicable scope: 1, eyebrow sagging; 2, nasolabial folds; 3, cheek and cheek skin and fat tissue sagging; 4, jaw edge skin sagging, pile up; 5, neck skin sagging. In addition, what breast lift, buttock lift, etc., I think this is a little unreliable. If the breast droop is obvious, buried hundreds of threads are estimated to be useless, or have to do plastic lifting. The indications should not be expanded, as if anything can be done with the line.