When it comes to the question of facial fat grafting, whether it is permanent or not, it is important to first cite a concept – “fat viability”. After 3-6 months after the surgery, when the transplanted fat forms a blood flow with the surrounding tissues and is no longer absorbed, only then can it be said that this part of the fat has become viable. The fat survival rate has been reported to be 30%-70% in different literatures. Therefore, after facial fat grafting, it is necessary to go through 1 or 2 additional injections according to the absorption rate of each area to achieve satisfactory results. In this sense, facial fat grafting is permanent. However, the fat that has been grafted into the body is constantly changing with the body’s metabolism. For example, if a candidate loses weight after fat grafting, or if there is an increase in metabolic rate such as late nights, smoking, alcoholism, etc., the grafted fat tissue will be metabolized and absorbed just like fat in other parts of the body. In this sense, fat grafting again cannot be called permanent. It is like the gas tank of an automobile, which can only run farther if it is filled up halfway. The key to maintaining the efficacy of fat grafting also relies on the later maintenance in order to achieve long-term satisfaction.