H.W.
My 3 1/2 year old had the same symptoms and her white dot was on the front, bottom. It was also hard like a tooth, but wasn't right on top of her gums though so I was afraid it was a tooth that was growing very crooked already. The doctor said it was a mucorele. It is called an Epstein's Pearl if it were on the roof of her mouth. It is essentially a big clump of skin cells that form on newborns sometimes. He said it should go away within a few weeks. Maybe that is what it is...