Follow-Up:
One of you kind people suggested it might be the sodium laureth sulphate in the toothpaste. So...I stopped using any and just brushed my teeth with baking soda.....viola! My chapped lips cleared up in just 2 days! I also had noticed that my face seemed almost burned after using Phisoderm for "sensitive skin" to wash with...I checked the ingredients and sure enough SLS was in the Phisoderm too. I have found some Jason toothpastes without SLS and will try that soon, but for now I'm sticking to the baking soda! Thank you so much! Nadine