Will Rf microneedling dissolve filler and tighten lower face?

Hyaluronidase should remove hyaluronic acid fillers. Combining it with external standard ultrasound can be helpful. You should be evaluated by an aesthetic dermatologist to determine if the sagging is indeed due to filler. We have utilized the Profound long pulse micro needle radio frequency to produce robust skin tightening.  Jeff Rapaport MD FAADRealself Verified All-star

Microneedling with RF (Radio frequency) or Morpheous 8 is the pinnacle in skin care! You get go as deep as 4 mm and really change the texture of your skin. The best way to think about it is "microneedling on steroids". Fillers typically get injected much deeper than that, in most cases right above the bone. Good luck with your treatment. You are going to love your Morpheous 8 results. 

The only way to truly dissolve filler is through Hyaluronidase injections.  RF microneedling won’t help this at all.  If you are looking for a way to tighten the skin I would suggest Thermage.   Thermage with RF is the best non-surgical way to tighten the skin, especially the jowls.   Please consult an expert in Thermage for the best cosmetic results.   Best, Dr. Green