1. Very unlikely to get an oral STD.
2. If you already had mono (Epstein Barr) you can infect others even if you don't have symptoms, but you would be immune yourself.
What about my first question ?
STDs from kissing?
by the time we reach 40, 90% of us has had ebv. it's incredibly common and most of us don't get ill enough from it when infected to even think twice about it. it's not a part of routine testing except for pregnancy.
no, you won't get ebv again, you already have it.
grace