I stretch as far as a football field,
Yet I fit in the palm of your hand.
I will make you bleed if you don’t use me often.
You put me in your mouth but don’t eat me,
Then you throw me away.
What am I?
Floss. It typically comes in 100 yard packs, which fit easily in your hand. If you don’t floss regularly, your gums will bleed. You use floss in your mouth then throw it away when you’re done.