Hyaluronic acid is a hyaluronic acid substance, which is a substance born in human skin and has a strong water shrinking effect, and can be used for facial shaping, hydration and filling. At present, the majority of hyaluronic acid products approved by CFDA (State Food and Drug Administration) are valid for six months, and some imported products have a clinical validity of one year. For most beauty lovers, hyaluronic acid can be used for a long time, repeatedly and many times. However, if you stop using hyaluronic acid after a long period of time, the following situations may occur: 1.After all the injected hyaluronic acid is metabolized, the beauty seeker may regain the skin state before injection, but due to the moisturizing function of hyaluronic acid, it will relatively improve the skin; 2.The beauty seeker will have loose skin, sagging, or even wrinkles, and serious skin redness and swelling will occur, but it is rare; 3.If the beauty seeker injects hyaluronic acid, the skin will be saggy, sagging, or even wrinkles, but it is rare. If the applicant injects hyaluronic acid for face slimming, after stopping the injection for 3-6 months, it is likely to rebound; 4. After using hyaluronic acid for a long time, the applicant will become psychologically dependent, thinking that he or she will not be beautiful without hyaluronic acid and cannot accept his or her original appearance. Therefore, it is best for beauty seekers to understand the knowledge about hyaluronic acid before the injection of hyaluronic acid, so as not to blindly go for hyaluronic acid and not to stop at will.