Answer:
What has many teeth but can't bite?
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
At night I come without being fetched, and by day I am lost without being stolen. What am I?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.