Answer is bottom front teeth
Reason
Firstly, this area is a difficult spot to clean, especially if the head of your toothbrush is bulky. It is very easy to skim over, leaving plaque behind. Also, there are saliva ducts present on the floor of the mouth, adjacent to these teeth, so saliva is continually bathing this area.
Answer:
the body would usually fight both the vaccine (while the vaccine is also fighting the virus)and bacteria in body
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I think that the answer would be NO, the said disease only transmitted trough injecting the said virus in your blood stream and also transmitted sexually. I hope you are satisfied with my answer and feel free to ask for more if you have questions