Injections are very popular in the modern society, it just meets the psychology of beauty seekers that want to become beautiful but do not want to open surgery. Will hyaluronic acid injections set the shape for a long time? First of all, we need to understand what is hyaluronic acid? It is an important basic substance for skin hydration, itself is also a component of the human body, it has a special role in water retention. Hyaluronic acid has a size: small molecule hyaluronic acid can penetrate into the dermis, has a slight expansion of capillaries, increase blood circulation, improve intermediate metabolism, promote skin nutrient absorption, has a strong anti-wrinkle function, can increase skin elasticity, slow down skin aging. The molecular weight range of small molecule hyaluronic acid is generally 400000~1 000000, which can be used for soft tissue filling and removing deep wrinkles. Large molecule hyaluronic acid can form a breathable film on the surface of the skin to make the skin smooth and moist, and can block the invasion of foreign bacteria, dust and ultraviolet rays to protect the skin from aggression. The molecular weight range of large molecule hyaluronic acid is generally 1800000 to 2200000, which can be used to fit contouring. How long does hyaluronic acid injection for rhinoplasty set the shape? After hyaluronic acid rhinoplasty, the shape is basically set in about seven days. But to achieve a rational effect, it needs to be after one month of hyaluronic acid rhinoplasty. At this time, the shape after hyaluronic acid rhinoplasty is the most stable. How long can hyaluronic acid injection rhinoplasty last? Hyaluronic acid rhinoplasty is not permanent, the maintenance time varies from 6 months to 8 months depending on the brand and the location of the method used.