The main ingredient in panda injections is a type of hyaluronic acid, which is used to fill the tear troughs and usually requires injections once every six months to a year. The use of panda injections around the eyes can be used to fill the tear troughs and promote the fading of dark circles, among other ophthalmic cosmetic procedures. However, after filling, it will gradually break down and metabolize away, resulting in a slow failure, and it will be necessary to repeat the injections again to achieve the cosmetic purpose. Generally speaking, in most patients, hyaluronic acid will be completely metabolized in about six months to a year after injection, at which time the tear trough will reappear and repeat injections will be required. Each patient is different and the frequency of injections will be determined by the doctor at the time of the review based on absorption.