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Unethical

This photo us unethical because Newsweek is basically saying that this woman's teeth aren't good enough to be in their magazine, so they fixed them. It's just rude. And those aren't her real teeth so they're basically lying to everyone.
Not as unethical

I don't find this photo unethical because the pyramids are still the same, pyramids, they're just a little closer together. It wouldn't have looked as good if you could only see half of each pyramid because they didn't fit on the cover. National Geographic was doing their readers a favor by making the cover picture more interesting.