Answer:
My teeth help me suck.
I am the key that is the hardest to turn
I'm sometimes white but most often I'm black. I take you there but never bring you back.
Soft and cuddly I'll pull on your heart. But take my last name and I'll tear you apart.
Many people own a copy of me. Without me the world would fall.
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?