I just found this out which is mind boggling.
DO NOT LICK YOUR LIPS EVER.
The enzymes in your saliva can break down and dry your lips.
Also when the saliva evaporates off your lips, it draws away any moisture in it causing it to dry even more.
This is how we get chapped lips. our lips are dry, we lick them, they feel moist for a bit, but then get dryer, so we lick again, then they get even dryer. ITS A VICIOUS CYCLE.
Apply lip balm (non flavoured or coloured) whenever they feel dry and drink water.
Also petroleum jelly before you sleep, slather that ****!
This has been a life changing technique for me thought i'd share. No more chapped lips