Answer:
I'm white and I'm used for cutting and grinding. When I'm damaged people usually remove me. What am I?
In my life I must bare my bloodline I must share.
Four leaves I have.
I can sizzle like bacon, I am made with an egg. I peel layers like onions, but still remain whole. I can be long, like a flagpole, yet fit in a hole. What am I?
You write on me and secrets I can keep. In places never seen. I spin like a top. Though stiff as a board I'm often described like a mop.
Give it food and it will live, give it water and it will die.