Quote - Is it me or did anyone else notice? I'm not too sure, but it seems to me that in many many renders teeth end up looking too bright. Even in those where the 'nostril flow' has been fixed, the teeth, where they should be in a shadow, look too bright... Like a commercial for Orbitz!
Ends up making smiling faces somewhat unnatural?

Often yes.
Sadly it's not only the brightness/whiteness but the lack in matching teeth color and skin color.
I don't even want to speak about teeth colors and age and lifestyle.
For some sort of portrait picture it is certainly more important to get the teeth colors right if the teeths are visible than it would be in some larger scene.
Considering all the other errors in any arbitrary picture I won't say this is among the major esthetical transgressions.