It depends on the type of filler used. We have good experience removing Bio alcamid but silicone or artecol would have to be removed along with some fat housing the filler. Fillers contain no inherent magic and the MD using them must understand and follow the proper aesthetics of facial beauty for the creation of a naturally, more attractive face.
Permanent fillers must be injected into the fatty layers of the face just like temporary ones used for facial shaping and contouring (Perlane, Radiesse and Voluma). The problem is this fatty layer does not stay put but sags down and inwards towards the nose and mouth taking the permanent filler with it. This, obviously isn’t the desired aesthetic result and as such, I won’t use permanent fillers in the face. Cheek Implants, Chin Implants or temporary fillers are what I have found the most aesthetically appropriate