Can not select parts of the mesh Hey I am new to the program not sure what I did wrong here. I can't select any vertices, faces or edges on the tongue and gums of my model, which I need to in order to colour them in UV Editing mode. I appreciate any sort of help!
The issue is that you are not editing the tongue and gums.  Try exiting edit mode, selecting one of them, and then switching back.  That should fix it.