I have a habit of rubbing my tongue where the lips meet the gums (near chin). Now, i have white gums on the lower part of the front three teeth. It is not painful always, I have no problem while eating and drinking. In fact, when I drink hot beverages, it feels good. The Pain is not 24x7 and it is mild. Need to know what could cause this and if there are any remedies which relates to such issue.