For a balanced face, your injector may adjust not just volume but also lip tilt, corner support

https://www.google.com/maps/d/u/0/embed?mid=1QEYW_91VlB04KhtnnO0ekzq38kYaRHA&ehbc=2E312F&noprof=1

For a balanced face, your injector may adjust not just volume but also lip tilt, corner support, and the projection of the central pout.