You can not get Hepatitis C from kissing. Hepatitis C is transmitted via blood to blood........meaning, if you had an open cut and someone with Hepatitis C got their blood on your cut it can be contracted this way.
As far as the saliva killing the Hep C Virus, I can not say Yes or No on that question. I'm taking it by your posts that you have been around someone with Hepatitis C, yes?
Here are a few links to some information that may help to answer some of your questions. Hope it's ok to post these links.