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Syphilis sores can be in the mouth, so it is possible to get syphilis from deep kissing. But it is not a common way for syphilis to be passed.
Sexually transmitted infections (STI) like gonorrhea and Human papillomavirus (HPV) can also be passed with deep kissing, but they are also not commonly passed this way.
The herpes simplex virus (HSV) or cold sores can easily be passed with deep kissing.
Have a look at our web page on Types of STIs for more information on these STIs.
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This answer was posted on August 9, 2017