How about 'blackened teeth?'

"but no culture ever preferred yellowed teeth to whiter ones"

True, signs of neglected physical care have never been fashionable. Even those wearing pre-stressed clothing or going for the patchy hobo-chic, have only been able to pull it off when their physical appearance shows no disease or neglect.

Though in medieval Japan, courtly ladies took to blackening their teeth. This was part of their superstitions over death ( avoid calling the number "4" by its proper name, its a homophone with "death." ) In this case, the teeth are the one part of a skeleton which is revealed when its user is alive.

However, you can bet that the choppers below the dye-job of young maidens were pearly-white without any decay.

Dante