Answer:
I fly away as soon as you set me loose. People around you may slowly move away once they sense my presence.
You cannot keep me until you have given me. What am I?
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
I'm white and used for cutting and grinding. When I'm damaged, humans usually remove or fill me. For most animals I am a useful tool. What am I?
The sun bakes them, The hand breaks them, The foot treads on them, And the mouth tastes them. What are they?