Like the teeth themselves, under the right conditions the gunk on your teeth may survive not just thousands but millions of years in the grave. Isn't that good to know.Advanced dental decay and plaque buildup have been detected in Dryopithecus carinthiacus, a primate that lived in Europe 12.5 million years ago, suggesting it doted on high-sugar fruit. Sivapithecus sivalensis, who lived between 9.3 to 8.7 million years ago in Pakistan, was also apparently frugivorous. Analysis of ancient plaque has shed light on the mobility of Neanderthals and other hominins, as implied by dietary changes, and shored up the thesis that...