Answer:
The more you add the less it weighs. What is it?
I'm white and I'm used for cutting and grinding. When I'm damaged people usually remove me. What am I?
I'm very tempting, so it's said. I have a shiny coat of red and my flesh is white beneath. What am I?
I can be cracked, made, told, and played. What am I?
As a stone inside a tree, I’ll help your words outlive thee. But if you push me as I stand, the more I move the less I am.
No matter how little or how much you use me, you change me every month.