My experience was very harmful using saliva. I used to get through the day by licking my lips and nibbling at the skin. It would keep the crusting at bay, but it didn't stop my lips from being inflamed and painful. I did this for years and would not recommend it. I've been doing moist healing for two years now and have seen definite reduction in the size of my crusts. Still not healed, but going to stick with it. I personally believe you can further damage your lips by going the licking route, but that's just my two cents.