Answer:
You use me between your head and your toes the more I work the thinner I grow.
Better touch me before you proceed to second. What am I?
If you drop me, I'm sure to crack. Give me a smile and I'll always smile back. What am I?
I'm at the head of an elephant and at the tail of a squirrel
I always follow you around, everywhere you go at night. I look very bright to people, but I can make the sun dark. What am I?
No matter how little or how much you use me, you change me every month.