... I can't decide if I should be serious here or not. xD
Anyway, if I'm not wrong, having multiple rows of teeth might increase the amount of bacteria they produce. Also, when you sleep, the amount of germs in your mouth multiplies, which is why you always have bad breath when you wake up.
I think it's a safe guess that the imprisioned sleeps a lot, so... yeah, it doesn't add up to a flowerfield when you put all that together, that we can be sure of.