The tooth thing may seems somewhat far-fetched to some, but really it isn't *that* far from reality. In my family, it is not uncommon for the lower permanent teeth to come in before the baby teeth come out. We have always had to make a trip to the dentist to remove the baby teeth aka 'second row of teeth.'
I don't know anything about hypodentology, and I suppose the second row of teeth in question are not merely baby teeth, but it is not a crazy, off the wall concept.
But you have Elvish blood in your family, right? :-)
Happy New Year!!! :-)