Scrolling through and testing the morphs in ue4 and i see there's morphs for the tongue but not the teeth?

You see tongue morphs for better visemes.

Teeth morphs are only available within CC3. They are not exported as blendshapes. Basically, the visemes and facial expressions are what are exported.

How im suppose to animate a face when the teeth dont move but the tongue animates through the teeth? Thats not gon give me better visemes it's just gon make my animation look dumb as shit. And they got the nerve to say this is industry leading 3d character generation and animation software. I've never seen production quality animations where the human characters teeth don't move.

Thought you meant shaping morphs. Those are not exported. 

If you have the latest CC3, click on the little gear next to the engine target. There you will find an option to add a jaw open morph option that uses just a mesh morph. It will export as one of the blendshapes.