Q.3 : I'm white, and used for cutting and grinding. When I'm damaged, humans usually remove me or fill me. For most animals I am a useful tool.What am I?
Q.5 : A time when they are green, a time when they're brown, but both of these times, cause me to frown. But just in between, for a very short while, They're perfect and yellow and cause me to smile! What am I talking about here?
