The number of PDO threads needed for a lower face thread lift will depend on the individual and their specific concerns and goals. Factors such as the amount of sagging skin, the desired degree of lift, and the patient's budget will all be taken into account when determining the number of threads needed. The specialist may use a greater number of threads for a more dramatic lift or for a larger treatment area, and fewer threads for a more subtle lift or for a smaller treatment area. As a rough guide, typically around 4 to 8 threads are used for a lower face thread lift. A qualified and experienced medical professional will be able to assess your needs and determine the appropriate number of threads to use.