This is a great podcast.
Not sure if that link will work but I really enjoy the podcast Stuff You Should Know. They did a great show on fluoride in the water and I would recommend it to everyone.
Here is a print version of it but the audio is MUCH better. The bottom line is, fluoride is a hazardous byproduct and there are many reasons we should avoid ingesting fluoride day-in and day-out in our water. This is a debate within the health field but worth reading up on (or listening to this fun show).