His character is being psychologically pulled apart both mentally and physically (physically via the tooth and the oozing, and mentally via his breakdown at the end). The whole film contains subtle references to dichotomy (the two symmetrical apples and plates, the mirror, the lights flicking constantly between on and off at the end).
I think this could particularly resonate with the youth of today, as in this increasingly media saturated world it seems more difficult to acquire and maintain a solid identity, and in a way, this film represents that.
