Tears are salty. Normally saline solution doesn't burn the eyes, however, to treat pink eye the salt level is increased in the solution to be effective, and it will smart the first time, or two until it gets the pink eye under control a bit. Any body part excreting mucosa, can usually be treated with a salt solution. Saline solution is used on infants to clear stuffy noses. Dentists recommend salt water to rinse the mouth. Our bodies need a certain amount of salt to help us stay hydrated, so a little saline in an IV works fine. Gatorade, etc. help hydrate better because of saline, as well as sugar in the flavored water. Skin, on the other hand does not excrete mucosa. Get a cut, especially a paper cut, and the saline will burn. Cut your hand, then go salt meat for supper. It will smart.