No there are no separate upper and lower Jaw parts.

But I have to warn you.

In their default state? They are dead ugly as hell.....
And you have to rapair some mesh errors in the eyes, lashes and the head before you can actually start. Oh, and there is a mesh error at the bottom of the left index finger. :-) An easy one. :-)

But afterwards???
They can be the most user friendly figures you have ever seen.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!