Many candidates go to plastic surgery institutions for hyaluronic acid fillers in order to improve their faces. Some candidates may find that there is no obvious effect after the injection, which is because factors such as body fat rate and age can affect the absorption of hyaluronic acid. The number of injections as well as some daily bad habits and other aspects may affect how fast or slow the hyaluronic acid is absorbed. The hyaluronic acid is not effective after injection, that is, the injection site has returned to its original state after one week of injection, and the injection effect has disappeared. It is very likely that the injected is not hyaluronic acid, the real hyaluronic acid injection can generally be maintained for 6-8 months. It is recommended that the applicant go to a regular hospital for examination to determine whether the injected substance is hyaluronic acid, and the regular physician will judge the time of its re-injection. However, if the effect does not appear within a certain period of time, the candidate does not need to be nervous, go to the hospital and inform the doctor, who will check and then carry out remedial repair work according to the actual situation. After the injection of hyaluronic acid, candidates should pay attention to maintain good habits and skin moisturizing, such as the injection of the wound crust off, hydration, moisturizing.