Pdo Threads are 24 strands of pdo threads screwed together for filling deep depressed areas of the face. When implanted in the dermis of the lines, the 24 strands of pdo threads will "explode" at the same time to occupy more space in the dermis to achieve the filling effect. During this period, it is important to avoid taking collagen, because external supplementation plus self-stimulated collagen will cause collagen accumulation and folding, which will lead to a series of sequelae such as bumpy, stiff, and even facial collapse.