Thanks guys. I am affraid it is tarter build up and isn't that permanent? I have some new toothpaste coming in the mail (thanks vainchik Ill take your advice) I'll just scrub and scrub.
Peters, we have toys of every kind, but I'm sure he would think new ones were a good idea! I thought about bringing him to the vet for it but I am really against putting them under unless really nessesary. I don't think they do teeth cleanings anyother way...and even if they did, not with Thor!