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The Carousel of self-refreshing teeth used to move, but then they froze into place because teeth did an evolution, the tooth that was in the process of phase shifting back into the body got stuck there forever.
Now the tooth in the back of your mouth is in this half-state of existing and being garbage collected, but then the garbage truck never shows, so the immune system irritates the entire area with a: "What the fuck is this mickey mouse shit doing on my federation vessel?"