Hyaluronic acid was originally only used for moisturizing, but now it has been included in the ranks of wrinkle removal and plastic surgery. This plastic surgery technology uses non-animal-stable hyaluronic acid cultured by bacterial fermentation, and fills it with hyaluronic acid. This method is used to inject into the folds and depressions of the dermis, or areas where plumping is desired, to achieve the effect of removing wrinkles and modifying the face. It can immediately remove wrinkles and change the appearance. The most powerful function of hyaluronic acid is moisturizing. After hyaluronic acid is slowly absorbed by the human body, it will combine with human cells to promote the growth of collagen and make the skin better. After the hyaluronic acid has expired, it will become irritated without hyaluronic acid. There will be no adverse effects if the skin slowly shrinks and returns to its original state before injection. Therefore, the skin will not become saggy after injection of hyaluronic acid filler.