The wisdom of public health authorities has been on everyone’s mind, this year and last. In Calgary this fall, it will be on the ballot. Voters will be asked during October’s civic election whether they want to resume adding fluoride to the water supply. City council had ended the practice a decade ago, undoing voters’ decisions in the fifth (1989) and sixth (1998) plebiscites in the city’s long and winding history with water-borne anti-cavity intervention.