You are looking for a from of secondary color correction.
I think the tools in PPro 2 allow for this.
alternatively, if you duplicate the image over itself and use some form of crop with feather and lumi-key to loosely isolate the teeth …you could then apply a color corrector in top of that to try to tone down the those pearlie whites… Increase the feather to hide the transition between the FG layer and the BKG layer. 🙂
to set up the lumi key you might want to sample the teeth as if you were keying them out….then invert the result to leave the teeth and key the rest.
Alex