Salt, Freshen Your Lips

When I was primary school, I listened to the radio that the salt could be freshen the lips...Ussually We just using lips protection (lips gloss) or some butter to avoid dry and broken lips...and after I knew it, I tried it...
How to do?

Take some salt and mixed it with the water, then just use your finger to put the salt water into your lips, just do it before you sleep, it's very good to avoid broken and dry lips...