Under normal circumstances, a single face slimming injection lasts for about six months. When the patient has several injections in a row, the maintenance time may be longer. At the same time, the individual’s physical condition and living habits will also affect the maintenance time of face slimming injection. The main ingredient of face-slimming injection is botulinum toxin, generally patients can maintain the time of about half a year after one injection of face-slimming injection. When the number of injections is more than three, it is recommended to inject once a year afterward. The time that a face slimming injection can keep is also related to the individual’s physique and living habits. Avoid touching water until the postoperative wound heals, otherwise serious inflammation will occur at the injection site, shortening the duration of the face-slimming injection. However, due to differences in injection physicians and post-operative care, etc., there is a direct impact on the final maintenance time. For candidates who are interested in face slimming injection, it is recommended to visit a regular hospital and under the operation of a professional doctor.