DORA: Why do I have bad breath?
WENDELL: Do you have bad breath? You see, I really wouldn't know. Worms don't exactly have a sense of smell -- at least like you humans do.
DORA: Hmmmmmmmmmmmm.
WENDELL: But, don't worry if you do. Bad breath is perfectly natural. In fact, it may just be the odor chemicals from food that you just ate like onions or garlic. Or, of course, it could be caused by mouth rot?
DORA: Mouth ROT!?! E-e-e-e-w-w-w-w-w-w!

DORA: What's mouth rot?
WENDELL: Face it, Dora. Your mouth is a playground and there are an awful lot of little critters in your mouth, eating any leftovers they find, swimming, reproducing, pooping, dying....
DORA: WHHHHHHHHHAAAAAAAAAAAAATTTTT?
WENDELL: Yup. They cause tooth decay or that white cheezy stuff that coats your teeth in the morning. Dentists call it plaque -- and if you don't watch out it hardens into mouth concrete that dentists call calculus. (No, not the brand of mathematics!)
In fact, there must be 100 million of those little buggers romping around in there -- that's equivalent to almost half the population of the United States.
DORA: My goodness!
WENDELL: That's not such a big deal. There are millions, maybe trillions, of little critters on you and in you. And mostly -- you don't even know that they're there!
DORA: Really? Wow!

DORA: What can I do about bad breath?
WENDELL: If your mouth is a bit stinky, then get thee busy with a toothbrush and toothpaste! A clean mouth is a much better way to get rid of the smell than mouth perfume, or mouthwash. It's also a better way to stay out of a dentist's chair!
DORA: I'll keep that in mind, Wendell. See you later....