I'm against water fluoridation – and I'm glad that we don't have it in the part of Scotland where I live. I think it's a matter of personal choice. I choose to use fluoride toothpaste, because I recently lost some teeth in an accident, and therefore I believe I need to take extra care of them. I can spit out the water after brushing – of course, I will ingest a small amount of fluoride, but I can control how much.
Before this accident occurred I had good strong teeth, so I preferred not to use fluoride toothpaste.
One reason why I don't want fluoridated water is that fluoride is a halide and it can block the uptake of iodine, also a halogen, in the body. I recently suffered from an underactive thyroid, and I suspect that the reason was iodine deficiency. I treated this by taking high doses of iodine. I also started filtering my water, to remove chlorine, which is another halogen that can block the uptake of iodine in the body.
I suspect that this is the reason why drinking fluoridated water in pregnancy can lead to reduced IQ in the child, as recent scientific research revealed. The fluoride blocks the uptake of iodine, which is especially vital for pregnant women, as insufficient iodine levels in children can lead to reduced IQ.