Tooth Regeneration May Replace Drill-and-Fill

Friend eba has offered several reports about her and her husband's dental experiences of late. Thus far, dentists are still making their boat payments by using mechanical means for repairing teeth - drills, filling, crowns, and implants. Some new techniques, still in the research and testing phases, may allow our teeth to regenerate themselves. The new procedures still require intervention by dentists, so they'll still be able to afford their Rolex watches.

This, by the way, is one of my Pearly Gate questions: why don't human teeth automatically repair themselves? The teeth in some animals, such as chipmunks and squirrels, keep growing, so the animals must eat hard food to wear down their teeth. We humans, however, get two sets of teeth. The first jettisons itself fairly easily. The second, so-called permanent set, crumbles and fails over the next three or four score years, bringing us pain and an increasing reliance on soft foods. What evolutionary (or creation-scientific) advantage does this dental design bring?