Answer:
I'm white and I'm used for cutting and grinding. When I'm damaged people usually remove me. What am I?
Long and thin red within with a nail at the end.
I am partially baked. I am not completely lit. I am a portion of the moon. I am lesser than full wit. I am a divider of the hour. I am not a total lie. I am a sibling through one parent.
Light hides me and darkness kills me. What am I?
In buckles or lace I help set the pace. The farther you go the thinner I grow.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.