I can't help but comment on this I have had dry lips lip biting for as long as I can remember and I wanna say I have had dental issues just had cavitation surgery and I'm now looking into removing my mercury filling as I have chronic fatigue hoping improvement in few weeks since this surgery I think mercury might be a problem here too if u have fillings or yeast related I believe it has something to do with dental and Sugar and yeast connect the dots type of thing mercury too