Answer:
An action done on mosquito bites
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?
I do not have eyes but I once could see. I used to have thoughts but now Iām empty.
What can fill a room but takes up no space?
In wealth I abound; in water I stand; as a fencer I'm valued all over the land; at Venice I'm famous; by farmers I'm prized; respected by law yet huntsmen despised; consternation and ruin ensue when I break; And the beasts of the forest advantage won't take.
Brings the sky a lot closer.