From the few yet unambiguous descriptions of bad teeth we have in the Legendarium, we can deduce with some certainty that they were not the rule among Elves or Men.
Gollum, after having degenerated in a dark cave for several hundred years, has only six yellow/white fangs, which, however, are still sharp.
At least one orc is described as having yellow teeth, hardly surprisingly so.
Morwen, wife of Húrin, only had 'broken teeth' after being forsaken in the wild for a long time and having become generally ragged (cf. Wanderings of Húrin).
Of Finrod, however, it is poetically said that he slew the great wolf 'with hands and teeth'.
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