That was the first thing I noticed too - gums that were bleeding most of my life stopped bleeding. And I've never had it since.
When you go to the dentist don't tell them about oil pulling before the exam. They won't be impressed. Wait for them to tell you about the shape of things before you comment. If they're chomping at the bit to give you some kind of expensive procedure they won't be very positive anyway.. Not that that kind of thing ever happens ... ;-)