Instruct: Classify the given comments as either toxic or not toxic
Query: When Port Angeles citizens are confronted with scary anti-F propaganda which references dozens of studies that allegedly show fluoridation causes harm, narrow it down.  Ask which one study they believe best proves fluoridation causes harm.

Any study presented will have one or more of these characteristics as any rational, educated, impartial individual will be able to confirm.
1) The study will have nothing to do with drinking optimally fluoridated water (OFW).
2) The study will deal with exposure to fluoride ions at far higher levels of exposure than found in OFW.  FOs seem not to recognize that any substance is a poison at high enough exposure levels – even water, oxygen, phosphorous, vitamins, caffeine, sodium, iodine, etc.
3) Actual conclusions have been distorted/misused/misstated to fit anti-F propaganda.
4) Conclusions will only be suggestion of a possible correlation without proper adjustment for other potential causes and they are proof of nothing.

So, no proof of anything.