The basic of freedom is questioning and thinking, right? Does the school tell this to the students, to questioning?
Check the water fountains in the school, how the water smells… There is fluoride in the water, right? We do have filters to filter the fluoride out of the water, the problem is these filters are expensive, is there a fluoride filter in the water fountains in the school? As a parent, ask and check the water in the school what kids drink… Check your own water, bottled water etc…