As you were advised, you did not have a risk for syphilis, so there is no reason to test, and no reason for treatment.
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No, syphilis is not transmitted this way.
In order to transmit syphilis, a sore must be present. If no sore was present, you're fine. Oral syphilis is almost always transmitted by oral sex, not kissing.
You do not need to test.
Not french kissing, not deep kissing, just a kiss on the lip.. and if it requires testing for syphilis when should i test? 3 months ?