Hi, when I was in the AIr Force, I was in pain management and on very high doses of percocet 10/325 6x/daily, plus 20 mg of Oxycontin.  I now have periodontitis and beginning stages of bones loss.  Did those drugs have any play in that?  I was on it for 5 years, and at the VA I finally got weaned off it.
With your query, to some oxytocin does not influence the periodontics, though it influences the immune system by participating in the release of cytokines it is not much significant in causing the periodontal destruction. But in your scenario since you are well aware of maintaining the good oral health you are doing good with your oral health. I would suggest you to visit your periodontist get the periodontal health status checked and follow his/her instructions. Hope this clarifies your doubt