Plastic injection experts pointed out that although the maintenance time of an injection is about half a year, if the dose is well distributed, the total maintenance time will be longer. "Instead of injecting a large amount of hyaluronic acid at one time, it is better to inject a small amount of hyaluronic acid in several times, with good effect and long maintenance time." For example, a person's face (excluding the forehead and temples) should have been injected with 3-4 pieces of hyaluronic acid, and only 1-2 pieces were injected for the first time, and then 1-3 months was added, and the final maintenance time would be longer than that of injecting 4 pieces of hyaluronic acid at a time.