Thank you Divina, cib, Snoopy
I'm not sure it is an enamel problem, but....I don't know much about tooth structure. When my friend went to the dentist, she had an unsatisfactory response to her question about it and since she is not very outspoken, esp with those in "authority", she did not question him further. Does this sound like Sil?

I also found it interesting that Sil has ill effects from Vaccinations. She did mention that she noticed this tooth thing about a year after she left on an extended trip through several 3rd world countries. She did have vaccinations before leaving and she also had a wart appear on her foot within that first year. Mmmm And she has had several weird skin eruptions, since her trip as well.
Anyway, she thinks she has found a good homeopath and is planning a trip to see her and perhaps the homeopath will know of a dentist who has homeopathic training.
Thanks again
jay