Hyaluronic acid is a transparent, viscous and colloidal substance, and it is a high molecular polysaccharide. It is a linear high molecular polysaccharide with glucuronic acid -N- glucosamine acetate as disaccharide molecular unit, with an average molecular weight of 6.5438+10,000 ~ 6.5438+100,000 Daltons (mass unit), which is filled in the gap between human cells and collagen fibers. The price of hyaluronic acid plastic surgery mainly depends on the amount of hyaluronic acid. Because hyaluronic acid plastic surgery is not only to increase the bridge of the nose, but also to consider the tip of the nose, and different people have different requirements for the height of the bridge of the nose, so the dosage of hyaluronic acid is different. However, in general, it is better to use 1-2 hyaluronic acid for hyaluronic acid plastic surgery. Hyaluronic acid can not only keep the skin elastic, but also lock a large number of water molecules, which can moisturize and lubricate the tissues and make the 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 dehydrate, lose luster and elasticity, and wrinkle and other aging phenomena will appear for a long time.