Simply put, line carving is a minimally invasive surgery to change the appearance. The depth of subcutaneous fat implantation depends on the patient's skin sagging, relaxation, wrinkles and face shape. , so as to lift the skin, improve the skin and make the skin younger. Although the maintenance time is not permanent, it can change aging and skin problems. The maintenance time is about 1-2 years, and the maintenance time will increase with daily care. The maintenance time is related to the amount of thread embedding, thread material and surgical treatment scheme.