Is Sculptura Good for Sagging Skin Around the Mouth and Jaw Line?

A mid lift will not restore the facial volume that it appears you have lost in the lower cheeks. Sculptra and Radiesse, both would be utilizing the products as an off-label use (not a specific indication for which the FDA approved the product). Fat injections can also be used and the hyaluronic acids but the latter would require many syringes and could be quite costly.

Sculptra works best to restore volume in broad areas. I find that it seems to work best in younger patients. While it can provide volume and camouflage certain areas, it cannot tighten or remove sagging skin, particularly in the lower part of the face. 
Many patients will opt for a second facelift procedure 5-10 years after the first, so depending on the areas of concern, this may be the best option. Of course, many patients would benefit from a combination of surgery, volume restoration with fillers or facial implants, and neuromodulators like Botox.
All the best,

Injection such as Radiesse, Restylane and Sculptra add volume to volume deficient areas.
Sculptra, as you would be using it off label, does add volume over time, and is a good option, however it requires several injections to get the volume needed. If it is a particular small area then restylane or radiesse may be a better option.
Have a re-do facelift is also an option. Just depends on how and what you would like to achieve.
Hope that helps.