Adopting a dog please help!!?

I want to ask this question because we have adoped a st bernard and i have 2 young kids which i am concerned about. The question is Have you ever been kissed (licked) by a slobbery dog (st bernard, mastiff, great dane. bulldog, boxer)? What did it feel like? How wet was it? The reason i want to know is because this st bernard slobbers a ton and is very affectionate (he likes to kiss your face, lips and mouth). My wife and i are ok with that and realy love the affection but i just want my 2 kids to not be alarmed or harmed by the slobber. The slobber is very overwelming and when he licks your face, lips, and mouth he leaves slobber dripping from your face! Is their anything we can do to get rid of the slobber? Is their any diseases they can get from being given wet slobbery kisses. Do you let your dog kiss you. Would you let your dog kiss you if it gave you wet slobbery kisses like this st bernard. I realize that this is one of the draw backs of getting a st bernard but me and my wife both wanted one for years. Is it ok to allow him to kiss us? even though he does slobber!