Normal lines, also known as nasolabial folds, are shallow depressions or folds that extend from the side of the nose to the outside of the upper lip and the outside of the corners of the mouth. Visible lines on the face often make oneself look more serious, old, and unfriendly, making people have a feeling of being difficult to approach. There are two main reasons for the appearance of lines: skin aging and sagging and too much expression movement. As we grow older, the collagen and water content in the skin will gradually lose, and the subcutaneous fat will also shrink and sag, causing the skin to sag and age, forming depressions and folds on the skin surface, which will produce the decree lines. People with rich expressions are also prone to produce lines, and the main methods of removing them include surgical wrinkle removal and injectable fillers. Traditional wrinkle removal by facelift focuses on subcutaneous peeling and tightening, which is difficult to improve the lines; even if it is barely tightened, the face will look tight and the expression will be extremely unnatural, and it will return to its original state in a short time. Subperiosteal wrinkle removal via under-eye surgical incision or intra-oral incision can achieve better results, but the surgery is more invasive and also has certain risks. Injectable fillers to remove wrinkles are a method that has emerged in recent years, and can be used as hyaluronic acid (hyaluronic acid) fillers or autologous fat fillers, both of which have their own advantages and disadvantages. Hyaluronic acid filling is simple and safe, with natural effects and immediate results; however, it can only last for about 6 months and needs to be repeatedly injected. The operation of autologous fat transplantation is a little more complicated, which requires fat extraction and treatment before filling, and the survival rate of fat transplantation is unstable and usually needs to be transplanted again; however, autologous fat transplantation is safe and can achieve relatively stable results after several transplantations.