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Aviation Physical Standards, CTT1... as I thought, there's no uncorrected limit, but it must be corrected to 20/20. I've got a buddy who's prescription is so minor, he never wears/carries his glasses unless he's flying.
As far as dental goes, Edge, you're not going to be able to get your Flight Up Chit with cavities, but they'll be able to fix them during RTC... if for some reason they can't fix everything while you're in training, you'll go to the Temporary Holding Unit until they can finish the work. It will not disqualify you though.