You can give it into GAME and they can remove the dents and scratches for $10-$20!
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bring it to jb-hi-fi and they have a buffer wich will clean all the scratches off the disc.
sit and wait for it to unfreeze...if it stays frozen for a long time, restart it..if it still freezes after restarting it...it must be scratched and you need to clean the scratches for it to work.
Breath on it and rub it on your shirt, if that doesnt work try cleaning it with a wet substance and rub it with a soft material. If that doesnt work, take it to a gamestore and have the scratches buffed out of it.
Take it out and put it back in and if that doesn't work blow on it and look for scratches
On a game disk, you don't, you'd have to buy a new one.