Does the V-line procedure tighten the muscles? Or does it remove fat?

I've heard terms like muscular faces and fatty faces.

Even if the jawline concerns are the same, is the see-through method different depending on the cause?

I wonder if the term "V-line procedure" is used to refer collectively to treatments that create a V-line.

It is really hard to tell if a specific procedure is a V-line procedure.

Does the commonly mentioned V-line procedure involve tightening muscles or removing fat?