Before having autologous fat filler, candidates will be told – after autologous fat filler, some of it will be absorbed and some of it will wither away, and the truly viable fat cells are the ones that will stay with you for the rest of your life. If a candidate is not demanding or has a high rate of fat cell viability, they can skip the secondary filler. Not all areas need secondary fillers The need for secondary fillers depends on two key factors: the size of the filler area and the blood flow of the filler area. For example, for small localized depressions and small tissue fillers such as tear troughs and earlobes, one filler may be sufficient. For large localized depressions such as forehead, apple muscle, cheeks and chin, although they can provide a good blood flow environment for the transplanted fat, 2~3 fillings may be needed. In the case of the temples, because there is more fascial tissue, the injections are not injected into the muscle surface, so there is a lack of natural blood flow, and 2~3 fillings may be needed to achieve the effect. In addition to filling the wrong area, a variety of factors can also affect the survival rate of fat Fat grafting is operated through precise techniques and skills, which can achieve effects equivalent to those of prosthesis, guaranteeing support, and the larger the amount of skin the more beautiful the effect. Usually, the retention rate of common autologous fat transplantation on the market is between 30% and 70%. The difference in the doctor’s technique will affect the final result of the surgery, and the probability of fat absorption also varies from person to person, and many reasons can affect the transplantation effect of each person. For example, the technique of liposuction, the selection of fat, the quality of transplantable fat, the doctor’s technique when transplanting and injecting, the area to be transplanted and filled, and the personal constitution of the surgeon will all affect the survival of transplanted fat. How to avoid multiple fillings to the greatest extent? Research has found that the lipoproteinase activity of fat tissue in the thighs is higher than that of other parts of the body, which is conducive to the regeneration and survival of transplanted fat cells. The highest activity was found in the thighs and buttocks, followed by the lower and upper abdomen in decreasing order. Based on this study and the deep fat distribution in these areas, the lower part of the torso is preferred as the donor area for autologous fat grafting. In addition, choosing a doctor with many cases, experience and solid medical skills can better guarantee the survival rate of the initial fat filling effect, and combined with professional aesthetic knowledge and experience in predicting fat absorption, it is also the key to avoid inappropriate filling and improve the efficiency of shaping.