Typically prior dental work would not be a contraindication for RF devices, but as always it is best to refer to the manufacturer for specific questions.
The RF microneedling device that I use is called Morpheus8. With the depths that are normally done on the face, there should be no facial nerve damage because the needles do not go deep enough to reach the facial nerve.
Photos would have been extremely helpful for assessing your particular issues--both front face and profile views.
However, generally speaking the use of HA fillers can work well for all kinds of facial and neck laxity and wrinkles There are HA skin boosters and biomodulaters that can help to...
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Everything you need to know about Microneedling RF