if you had protected sex and no chancre appeared after could you still have caught syphilis or does a chancre appear 100% of the time.
what I have gathered through other searches on the Internet is simply this: syphilis can be passed on through oral sex, but it is rare.
-----------Syphilis can be transmitted in either direction by oral-genital contact, but it's rare. ----------
-------- H. Hunter Handsfield, M.D.----------
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Really an impossible question to answer.
Syphilis is rare in developed countries and does not effect the mouth all that often and when coming into contact with a syphilis sore only about 1/2 the time the infection is passed on. But unprotected oral sex does pose a risk.