Bellafill can be used to treat the jaw line to get more jaw line definition. The satisfaction for this area of treatment is moderately low however. It usually takes a considerably large volume to treat the jaw line and few injectors use enough to make an appreciable difference. I routinely see patients who said that that had a couple of syringes of filler, Bellafill or another filler like Juvederm Voluma, who say they do not see much change.
To illustrate the amount of volume you may need, remember that there are 5 cc in a teaspoon. Each syringe of Bellafill has 0.8cc of Bellafill in it. That means you need 6.25 syringes of Bellafill for each side if you need about a teaspoon of volume to get good jaw definition on each side. Often the jaw area needs even more than 5 to 6 cc per side this to get reasonable results when it comes to filling in the jaw line.
While Bellafill will work as filler to improve jaw line definition, there are often more reasonable treatment options or at least more economical options.
This video shows just how much is in a teaspoon.