After 3 days, Juvederm or Restylane (any HA filler) is integrated into the tissues where it is injected. Most patients will note some minor degree of swelling after filler injection, partially due to the actual needle stick(s) into the tissue, partially due to fluid absorption into the HA. Though bruising is rare, it is possible, and when it occurs, it may take a few more days to reabsorb the tiny bruises. By one week, everything is pretty well settled, and dental work will not be likely to dislodge or remodel the filler in any way.
Of course, if you could easily reschedule your dental work for even another week later, that would reduce your concerns even further.