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?
I am an object which is used in baseball during the day I can't be seen at all
I am a kind of coat that can only be put on when wet. What am I?
I am found in the sea and on land but I do not walk or swim. I travel by foot but I am toeless. No matter where I go, I am never far from home. What am I?
I will disappear every time you say my name. What am I?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?