You do have proofreaders,right?
Obviously the teeth in the picture can't be both "100 times thinner than the diameter of a human hair" and "just less than a millimetre long". How on earth did that slip past the proofreaders? That "100 times thinner" figure refers to the prepared samples that the scientists put in their strengthometer. You can see a picture at http://www.bbc.com/news/science-environment-31500883.
Also I suspect that it's the cross-sectional area that is 100 times less than a human hair, not the diameter.