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Actually, your cat is probably more at risk not having the dental. Anesthesia science and medicine has come a long way, even in the last 10 years. The following website: http://www.vin.com/VINDBPub/SearchPB/Proceedings/PR05000/PR00010.htm is very informative and I'm confident will thoroughly give you the information/facts you are looking for.
Of course your cat's health status is crucial to the risks and recovery and I highly suggest, even if he/she is in good health, to have preliminary testing performed to make sure there isn't anything underlying that may compromise the surgery.
Best of luck and take care,