A look into a dinosaur's mouth
If you were able to take a trip to the "Jurassic World" theme park and look into a dinosaur's mouth, you'd probably be a little grossed out by what you saw. Scraps of food and plaque would probably be all over their teeth, which neither looks good or smells good. It's doubtful that dinosaurs oral hygiene would be rated very high by any oral health professional.
Dinosaurs could grow teeth back
Much like sharks, it is suspected that dinosaurs could grow any teeth back that were lost. It wouldn't matter if the teeth were broken off or rotted out, they would simply grow back once the tooth was out.
Dinosaurs had different types of teeth just like we do
We all know that dinosaurs like the Tyrannosaurus rex had big scary teeth, but did you also know that their teeth varied in size, length and function? Just like our teeth, dinosaurs' teeth were designed for different things. In addition to different dinosaurs having different types of teeth, herbivores and carnivores had very different types of teeth. Carnivore dinosaur teeth were typically used to tear and pierce meat, whereas herbivores had teeth that were made for grinding up plants.
Dinosaur bad breath
Dinosaur mouths would have differed greatly based on the diet of the dinosaur. You can bet that carnivorous dinosaurs, the ones that just ate meat, would have some pretty terrible halitosis. Their bad breath would come from all of the little bits and pieces of meat left between their teeth. It is suspected that dinosaurs with all meat diets, like the T. rex, would have a "septic bite." This means that their mouth is so full of bacteria that if they didn't finish off something when they bit it, the bacteria transferred from their bite would finish it off. This is still true of komodo dragons. While carnivorous dinosaurs would have had terrible breath, herbivore dinosaurs, who ate only plants, breath probably wouldn't have smelled much better.