It may not be thought about often, but recovered dental gold AKA "gold teeth" is one of the cheapest sources of gold scrap. Of course there are many more sources of scrap gold, but dental gold always has good scrap lots to start with. Dentists often want to get rid of their superfluous gold - it's not so often used for dental fillings or gold teeth anymore. So let the dental gold go from the other persons mouth into your wallet!

Let me reassure you about the provenance of the "finished product": gold teeth. It's very unlikely that any gold tooth you encounter comes from Uncle Harry or Auntie Jane who had them removed by the heirs before being safely lowered into the cool earth. Ninetynine point nine percent of all gold teeth on sale are from living persons who had them exchanged for nicer and more modern replacements.