This isn't the first time South Park has toyed with the space time continuum. If you remember back to Season 2's episode, 'Spooky Fish', you will remember that this has been done before. But I think they differed enough between that episode and this episode to make both episodes fairly good. The tooth trade was fairly intelligent for an idea made up by 8 year old boys. This episode introduced the character of Timmy, who has been one of my favourites since then. I particularly liked the scene where the American Dental Association were contemplating the impending doom by a giant half squirrel/chicken with a mild knowledge of algebra.
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