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The other expert is offline, but I will be happy t help you.Kissing is generally NOT considered to be a route of transmission for HIV infection. The CDC has provided this answer in regards XXXXX XXXXX risk of HIV transmission from kissing:
There are extremely rare cases of HIV being transmitted via deep “French” kissing but in each case, infected blood was exchanged due to bleeding gums or sores in the mouth. Because of this remote risk, it is recommended that individuals who are HIV-infected avoid deep, open-mouth “French” kissing with a non-infected partner, as there is a potential risk of transferring infected blood. Summary:
I honestly would NOT worry about this kiss, since transmission is really EXTREMELY rare - essentially as close to "impossible" as one can get unless the HIV positive person had active bleeding.