You can’t live without microbes. There are trillions of them inside your body and on your skin.
Run your tongue over your teeth before you clean them. You should feel a film on your teeth. This is a slime produced by microbes. But they are not just on your teeth – they're on your tongue, the inside of your mouth and all over your skin. Don’t worry – they are not going to eat you alive, and many of them are extremely useful.
