You've answered your own question really.
As good teeth became more important, so the Empire floundered.
The exact same thing happened to the Romans, when footwear became more important to people, and everyone started laughing at sandals.
(
mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ,
Tue 4 Jan 2011, 18:01,
archived)