Answer:
I am an English word with 3 consecutive double letters.
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?
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
I am the only word that looks the same when spelled upside down.
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
What never gets any wetter no matter how hard it rains?