Answer:
I am black white and read all over.
What has a head and a tail but no body?
Against the sun I protect your eyes and am often worn on the face of spies
I am easy to see but no one likes looking at me. Without me there would be no you. I can make you complain or make you happy. But you almost always take me for-granted.
A dragons tooth in a mortals hand I kill I maim I divide the land.
No matter how little or how much you use me, you change me every month.