Can the feeling that my jawline looks blurry be resolved with contouring injections?

Because the jawline looks blurry
I am considering contouring injections.

Even though I don't have much fat...
I am wondering if it is effective even if the lines are not clear.

Is it just a matter of the swelling going down?
I am also wondering if I can actually expect changes that will bring the lines together.

Duration of effect and
I would also like to know the re-treatment cycle.