Why are so many dentists so ignorant of the facts about fluoridation?

UK Against Fluoridation: Why are so many dentists so ignorant of the facts about fluoridation?: "A letter sent by a dentist to an MP with these qualifications BDS.,LDS.,DDPH, MA, claimed that he had studied fluoridation in considerable detail for many years.
In his letter he wrote.
'Outside this country, natural water fluoridation occurs in very many parts of the World, in some, the concentration is well above this level and as far as I know, no harm to the health of people or animals consuming this water has been reported.'"