hyaluronic acid is a transparent, sticky, colloidal substance. It is a macromolecular polysaccharide. It is a straight-chain macromolecular polysaccharide with glucuronic acid -N- glucosamine acetate as disaccharide molecular unit. Its average molecular weight is between 1, and 1 million daltons (mass unit), and it is filled in the space between human cells and collagen fibers. The price of hyaluronic acid plastic surgery mainly depends on the amount of hyaluronic acid used. Because hyaluronic acid plastic surgery is not simply about heightening the bridge of the nose, it is also necessary to consider the tip of the nose, and different people have different requirements for the height of the bridge of the nose, so the amount of hyaluronic acid used is not the same. However, in general, it is better to use 1-2 pieces of hyaluronic acid for hyaluronic acid plastic surgery. Hyaluronic acid not only has the function of keeping skin elastic, but also can lock a large number of water molecules, which has moisturizing and lubricating effects on tissues, making skin full, young and elastic. However, with the increase of age, when the loss rate of hyaluronic acid is faster than the growth rate, the skin will gradually become dehydrated, lose luster and elasticity, and wrinkle and other aging phenomena will appear for a long time.