Will exchange of saliva during kissing lip to lip between boy and girl will cause pregnency. If it happens whether we do it frequently

No!

will exchange of saliva during kissing lip to lip between boy and girl will cause pregnency. if it happens whether we do it frequently

No, but showing him your belly button with surely cause pregnancy.

How old are you?

I thought holding your breath while you kiss is a form of birth control. My friends told me wrong? Yes, how old are you?

... dear god...

Oh my! Where are your parents? We show a movie in 6th grade to explain these things.

She may be younger than 6th grade, that would be my guess.

But no, and honstly if you don't know what cuases it, you really don't need to be doing anything, it is what allof that ends up or leads to that is the issue