We may thus rule out negative effects larger than
0.14 standard deviations in cognitive ability if fluoride is increased by
1 milligram/liter (the level often considered when artificially fluoridat-
ing the water).
That’s a high level of hypothetical harm that they are ruling out (~2 IQ points?). I would take the dental harms many times over to avoid that much cognitive ability loss.
This temporarily confused me until I realized
it was not talking about the lightsaber Vader was using here, but about the one that Obi-Wan took from him in the Revenge of the Sith and gave to Luke near the start of A New Hope.