Answer:
Iβm white; perfect for cutting & grinding. For most animals I am a useful tool.
I am heavy forward, but backward I'm not. What am I?
I am flora not fauna. I am foliage not trees. I am shrubbery not grass.
What two keys cannot open any door?
I am the minerals vital for your good health.
I flow from the Homerβs mouth when he sees doughnuts.