Answer:
My teeth help me suck.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
A thousand wheels but move I do not. Call me what I am call me a lot.
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?
I am there when you sit, but gone when you stand. What am I?
What never gets any wetter no matter how hard it rains?