M.F.
My daughter has SEVERELY dry lips and we've found over the years that the ONLY thing that keeps them under control is lanolin (if you've ever breastfed you know what miracles lanolin performs!). She applies it every night before bed and once in the morning, and that is usually sufficient. THE BEST method (cures dry lips overnight) is to apply the lanolin immediately after getting out of the shower (or 2nd best, applying after brushing teeth) when the lips are most hydrated. When she does this, her lips are simply BEAUTIFUL the next morning, even if they were completely dry and cracking the night before! Hope this helps!