The overwhelming takeaway of We All Fall Down is that pretty much every character has absolutely perfect teeth. Forget that they are living in a post-apocalyptic word, and forget that the survivors must scrounge the countryside for food and water. Forget that supplies are scarce, that danger lurks behind every tree, and that the bodies of the fallen litter the streets. Forget even that some of the characters are essentially mindless savages, raised from childhood as mute warriors brainwashed to do nothing but serve their mistress. Even those guys have perfect teeth!
In fact, one might say that had as much effort gone into the storytelling and performances of We All Fall Down as went into the apparently painstaking dental care of its characters, it might have been a more interesting movie.