Best filler for hollow/dent above lip? Somehow this has developed and appears worse than the lines now. (Photo)

In certain lights, the dent causes a terrible shadow and I look disfigured. Would aggressive resurfacing help correct the dent along with the wrinkles? In the meantime, as Restylane silk doesn't seem to last long anymore when injected directly into the lines, will injecting the lips and/or lip border assist with softening the lines as well? Thanks so much!