Has it been shown that there are any wrinkle fillers (for mouth lines)that actually work?

Yes: For nasal labial folds we recommend radiesse, (dermal fillers) juvederm or Perlane and they can last for 6-9 months.

Certainly: The ha gel family (restylane, juvederm, etc.) all work well. They are also reversible, in case you're not happy with the result.

Yes: Restylane (dermal fillers) or boletero. Also Botox lite injected superficially can be very effective.