I am free the first time and second time, but the third time is going to cost you money. What am I?

Answer: Teeth

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More What am I ?

I am full of wisdom and knowledge. I get what you want in a blink of an eye. I am known to man as full of endless wisdom. What am I?
I am gentle enough to soothe your skin, light enough to fly in the sky, strong enough to crack rocks. What am I?
I am gold and can be black and white, I’m a symbol for a nation, when freedom took flight. What am I?
I am good at concealing what’s real and hide what’s true. Sometime, I bring out the courage in you! What am I?
I am greater than God, Yet a pen may write me, Faster than light, But the poor may own me, Larger than space, Though the stupid may know me, I cannot die, For life is never in me. What Am I?
I am green but not a tree. You can see me and sit on me and I grow around the world. What am I?
I am heavy forward, but backward I’m not. What am I?
I am hewn from Earth and Fire; But to the sky, I aspire. I am nothing but contented; Until my patient rage is vented. What am I?
I am hot then cold, a liquid then solid, and I am at once flaky and wet. What am I?
I am hot, sometimes soft, sometimes hard, sometimes runny and loose, sometimes I float, sometimes I sink but whatever form I take on I always go out and never in. What am I?
I am hot. I am hidden. I am cold. I am hard. I am sharp. I am soft. I am still. I am moving. I am above. I am below. I am two and one. Always changing. Always the same. What am I?
I am in heaven but not in hell. I’m in the devil but not in god. I’m in the river but not in the sea. What am I?