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Nobody knows for sure. We dont even know exactly how many species there are, let alone how to count them or how fast they grow. Estimates of the number of bacterial species in the oral cavity vary between 500 to 650 different species. They live on the teeth and tongue, of course, but biofilms also cover the cheeks and oral mucosa.
It's a tough question, but we now have the best answer yet. Last year researchers at Dalhousie University in Nova Scotia released the most rigorous estimate yet of how many species live on our planet: 8.7 million, not counting bacteria. Nearly 6.5 million of these species live on land versus 2.2 million in the ocean, according to the analysis. âHumanity has committed itself to saving species from extinction, but until now we have not had a good idea of even how many there are,â says coauthor Boris Worm, a marine ecologist at Dalhousie.