In November 2006, the American Dental Association announced that ingestion of fluoride is dangerous for babies. They have notified their members of this, but we are not aware of any effort to notify the public. You can read more about this and other risks of drinking fluoride at the Fluoride Dangers page.
Fluoride is easy enough to remove if you use enough of the right filter media. These fliters use as the media activated alumina. Activated alumina is not the material we know as aluminum. It is aluminum oxide, the same natural substance as sapphire and rubies, but without the impurities that give the gems their color. Aluminum is a more highly-processed man-made material fabricated in part by the addition of fluoride! Activated alumina is a resin with a very high surface-area-to-weight ratio, with a lot of tunnel-like pores that run all through it. This means that there is a lot of surface area against which the water interacts, thereby removing fluoride. Should there be leaching of materials from the first canister, the filter media in the second canister removes it. Customers who have tested these filters in their homes have reported 0 fluoride when new, and 0 fluoride after 6 & 7 months of use. View a research study report on the effectiveness of Activated Alumina.
This page describes the fluoride water filters offered by friendsofwater.com: fluoride water filters.