Is periodontal disease contagious / transferable?

I have a new GF, and she has periodontal disease. We open-mouth kissed 7/9 - and since then, I've had pain in my lower left palate. I visited the dentist yesterday, and they used a flushing machine around the sensitive tooth. They thought it might have been hard Italian bread, or a crouton, that got lodged between the gum-line and the tooth. I did not know about my GF's condition until talking with her last night. So - could my GF's condition have had anything to do with my developing a problem with my gum-line?