where does the vampire venom come from?

yes you would think it's like salvia but why can they kiss each other (bella and edward) in the movies you see they kiss quite passionately sometimes (for a short time but still) if it was in the salvia then why can she take it in her mouth withouth having troubles with it?

Maybe it a little of both? I think their teeth are always coated with venom but when they are hungry they produce more, kind of like saliva,for the hunt! :)

I'm w Silverain but the venom its also like saliva in our mouth. The reason why I think so is cuz in breakin dawn edward was usin he's venom to heal Bella's wounds, & some people know that usin saliva also can heal wounds special if u have one in ur mouth. And also when he's or any Vamp's mouth got watery it builds up like saliva does when we smell somethin real good.