The Mental Dental Viva

A viva examination was almost done,
All the students had left but one,
This dental student was taking ages,
Because he couldn't answer a single question asked by the sages,
Frustrated by the long wait,
The examiner asked in haste,
"What would be the biggest problem we would face,
If nobody had teeth in the entire human race?"
He expected "chewing", "speech" or "aesthetics",
The question was so easy, it made the other students sick,
To hear the answer he leaned a little closer to the student,
Who simply smiled and answered "Unemployment"