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Being too worried about your teeth can actually be a bad thing. We don't want to fuck a big, warm gap. Just don't push your teeth against our dick as leverage for sucking.
Also, try to deepthroat. I know it's kinda scary, but if you can do it then he will never leave you. And I mean hardcore deepthroat, like smashing your nose against his crotch and sticking your tongue out to lick his taint.
If you can't deepthroat, use your hand to grip the base of his dick. It'll make cocksucking a lot less tiresome, too.