I don't have super strong feelings on fluoridation one way or the other. Mostly because I'm not a doctor, dentist, or scientist, so my opinion on the matter shouldn't carry much weight. My main issue is that I suspect the judge and plaintiff's reasoning about this issue are roughly on par with that of Gen Ripper.
Fluoridation or not is almost certainly not a huge impact (given that there's no obvious large scale harm and we've run a very large natural experiment). I'm worried that this is a preview for more meaningful health and science issues where unserious concerns might draw a sympathetic judge and harm public policy.