The 40 Million-Year-Old Ecosystem In Your Mouth
Season 4 Episode 15 | 8m 14s | Video has closed captioning.
The hardened residue scraped off your teeth at the dentist is called your dental calculus, and your dental calculus is the only part of your body that actually fossilizes while you’re alive! And scientists have figured out how to study & trace the evolutionary history of these microbes over tens of millions of years.
Problems Playing Video? | Closed Captioning