Dr. Paul Connett is a graduate of Cambridge University and Dartmouth University and former toxicology professor who has spearheaded the anti-fluoride movement for the last 15 years. His book The Case Against Fluoride (Chelsea Green Publishing, 2010) is one of the most wide-read and thoroughly researched cases against fluoride in our water supply, from both an ethical and medical standpoint.
Here's a glimpse of his main arguments from the book. The Case Against Fluoride is a highly recommendable overview of fluoridation for concerned families.
Disclaimer: Aquagear has no affiliation with Paul Connett or Chelsea Green Publishing.