I have been *gently* exfoliating my lips in the shower each morning with a wash cloth to remove dead skin then I dab a little mineral oil right away. That seems to help a ton for me! Also I have an oil free moisturizer that I use on my face and a put it on my lips too.
My lips actually seem healthier and fuller since Ive been doing that?! Granted they are little more dry than with my typical lip products, I think I will keep up the shower routine after p2 but combine with my lip balm :) Good luck!