I see toggles for the viewing of separate dental tissues, but I can't seem to get them working. For example, I'd like to view the root canals. There are Show/Hide toggles for the enamel, etc. but they don't seem to do anything. Their translucency toggles also don't seem to do anything. I can focus on a tooth, then hit the cross-section button, but instead of showing the cross section of the focused tooth, it does a cross-section of the entire head. So, there's the root canal selections, but apparently no way to view them.

EDIT: Apparently, the hide/show and translucency toggles only work when viewing the head in a cross section. The root canal is also apparently only the empty space, so showed or hidden, there's nothing to view.