I believe that if you attempt to live just 10 days on water only, your lips and your mouth would improve slightly at worse, and at best become totally normal.
10 days only. That is all it takes.
What it means ?
No laundry detergent (all clothes washed by water only).
No contact with animals.
Minimum contact with people (who use cosmetics, soaps, shampoos, laundry detergents, perfumes, deodorants etc).
Nothing but water and air in your life for 10 days.
All you need is to move your mind, and the rest will follow.