Answer:
No matter how little or how much you use me, you change me every month.
When I get closer my tail grows longer, but when I go away my tail leads the way.
A dragon's tooth in a mortal's hand, I kill, I maim, I divide the land.
It is more feared than fear itself, And no one can escape it. It takes no sides and does not judge, it does not know to hold a grudge. It is the most clearest result, Of how life beats you by default.
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.