Answer:
I am always hungry, I must always be fed. The finger I lick will soon turn red.
I'm full of holes, yet I'm full of water.
What do people want the least on their hands?
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
What can be swallowed, But can also swallow you?
You use it between your head and your toes, the more it works the thinner it grows.