dino dental hygiene

[hammeris1@bellsouth.net]

Watching hippos let various fish clean their oral cavities on NG made me wonder 
whether or not dinosaurs and pleisiosaurs might have benefited from similar 
activity.

I know monitor lizards actually prosper from the noxious bacteria in their 
mouths for helping to bring down their living prey - do cold-blooded reptiles 
suffer from tooth decay?  Is it only a mammalian problem?

I would think a large theropod would just open its mouth and let small birds 
(once they'd appeared) to pick out the bits of meat between their teeth.

What about a kronosaur in the shallows at rest letting various fishes tidy 
their oral cavities?

Does the fossil record show any dino tooth decay issues outside of breaking a 
tooth off or having them broken by prey animal defensive actions?