Answer:
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?
What is harder to catch the faster you run?
What can be heard in court or used to carry briefs?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
It's been around for millions of years but is never more than a month old. What is it?
If all Wibbles are Criggles, all Borkins are Kwumblins, no Hoggles are Borkins, and all Criggles are Borkins, is it true that all Borkins are Criggles?