I’m white, perfect for cutting and grinding. For most animals I am a useful tool. What am I?

Answer: Teeth

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More What am I ?

I'm with you some days, but not on the others. I fall short on you always but mostly in summer. What am I?
I’ve been argued on my colour. Without me you’ll die. So many attempts on your life use me, so make sure you have many of my “White” friends. What am I?
I've got 4 eyes, 3 legs, 1 tail, and 12 toes. What am I?
If a man carried my burden, he would break his back. I am not rich, but I leave silver in my track. What am I?
If a man carries my burden, they will get crushed to death. Though not rich, I leave silver in my track. What am I?
If I am coloured, I smell, if I am burned, I smell, orange and yellow will melt me. What am I?
If I don’t keep time correctly it may mean death. I cause a beating that doesn’t hurt, but rather sustains life. What am I ?
If I drink, I die. If I eat, I am fine. What am I?
If I eat I'm fine but if I drink I die. What am I?
If you drop me I’m sure to crack but give me a smile and i’ll always smile back. What am i?
If you eat me, my sender will eat you. What am I?
If you have me, you want to share me. Once you share me, you won’t have me. What am I?