Natural remedies for Cracked Lips Why do lips crack- *.The change in the climate. *.Dehydration – Lack of water in the body. *.Exposure of Lips to Sun rays. *.Lack in Vitamins. *.Habit of smoking and chewing tobacco. *.Using cosmetics on lips- Most of the cosmetics contains chemical, which gives many harmful side effects including Cracked lips Treatment of Cracked Lips, How to cure cracked lips, home remedies for dry lips- Every day after your bath, apply Mustard (Sarso) oil in thenavelandmoisturizeit. The cracks in the lips will go and also your face will look brighter than before. Research shows you lose up to 10 times more moisture through your lips than you do elsewhere on the face or body.