Well, in my opinion, it is impossible to have eye infection because of using saliva. As we know that one of the primary benefits of using saliva in the eyes is that it can help people with dry eyes to increase moisture. And what is more, saliva used in this way can also improve the eyesight and prevent further dry eyes damage. As we know that dry eyes can be kind of annoying and dangerous, for it can cause serious corneal damage and may even result in blindness if allowed to continue or worsen without effective treatments. And at that moment, saliva can be used to treat this situation, leading to better result. And there is no eye infection left in your eyes.