Thank you for this great question. When I do Sculptra, I often inject 2 vials, and occasionally 3 vials. I typically dilute each vial in 9cc. Thus I often inject 18 cc in one session. When I first began using Sculptra, I realized how natural patients can look with an additional 18cc of volume. I explain that the water/lidocaine mixture goes away in a matter of days and then some of the lost volume gradually gets replaced with collagen in the ensuing weeks. Since I began using Sculptra, I have started to add the traditiona hyaluronic acid fillers at the same time. Thus even though I inject more than 20ccs of volume in one setting, patients continue to look natural and more youthful.If I am not doing Sculptra, and focusing on facial rejuvenation procedures, then it is not uncommon to add between 4-10 ccs one setting depending on patient concerns and physical exam. What I would recommend more than anything is that you chose your injector based on their qualifications and experience. I formally train other injectors on Allergan and Galderma products and know first hand that there is a wide spectrum of skills and experience out there.