Pardon my asking, but don't these people know how to brush their teeth?
Heck, even the royal family has bad teeth, and they're really Germans.
When was the last time you were around someone over 70? I am a fan of good dental hygiene, but I would guess there are more old folks here without all their teeth than with them. Periodontia and gum disease set in... a lifetime in a mouth wears on any teeth, whether you brush or not.
Most opt to pull teeth, because decaying teeth are a source of constant infection that is dangerous in old age.
This will be a great advance when it happens.