According to this article: Got Plaque? It May Be Linked with Early Cancer Death | Stronger Than Cancer plaque seems to be an indicator of a shorter survival.
More research is needed, but there are some interesting links here - perhaps due to inflammation or bacteria.
As our diet becomes poorer, our teeth suffer as well.
We need to think about maintaining a healthy smile as a more important health regimen - it's not just about having a pretty smile anymore.