Thought I'd post this in case it helps anyone suffering from sore and cracked lips.
I've had this problem for so long, could literally tear strips of skin off my bottom lip on a daily basis. Lovely, I know! I tried ALL the lips balms on the market, some gave more comfort than others but none actually stopped my lips peeling.
Turns out my lips were having a reaction to the toothpaste I was using or more specifically the SLS (sodium lauryl sulfate) in the toothpaste.
On someone's advice I tried an SLS free toothpaste, a Sensodyne one, and lo and behold two days later my lips are CURED.
I'm quite happy about this 