Everyone should get the right amount of fluoride. This is actually quite difficult to measure and achieve.
WHO seem to have a good viewpoint:
"The effects of fluoride are best predicted by the dose (i.e. mg fluoride per kg of body weight per day), the duration of exposure and other factors such as age (e.g. dental fluorosis). However, most epidemiological studies concerning the effects of fluoride on teeth and bone have correlated the effects with the concentration of fluoride in the drinking-water (mg l–1 fluoride) consumed rather than total fluoride exposure.
...
Perhaps the best general advice that can be given in relation to local conditions is that, at a minimum, the fluoride level in local water supplies should be monitored and the population examined for signs of excessive fluoride exposure (e.g. moderate and/or severe dental fluorosis and crippling skeletal fluorosis).
Where treatment to remove fluoride is practised, chemicals used should be of a grade suitable for use in drinking-water supply as outlined in the WHO Guidelines for Drinking-water Quality."
Everyone should get the right amount of fluoride. This is actually quite difficult to measure and achieve.
WHO seem to have a good viewpoint:
"The effects of fluoride are best predicted by the dose (i.e. mg fluoride per kg of body weight per day), the duration of exposure and other factors such as age (e.g. dental fluorosis). However, most epidemiological studies concerning the effects of fluoride on teeth and bone have correlated the effects with the concentration of fluoride in the drinking-water (mg l–1 fluoride) consumed rather than total fluoride exposure. ... Perhaps the best general advice that can be given in relation to local conditions is that, at a minimum, the fluoride level in local water supplies should be monitored and the population examined for signs of excessive fluoride exposure (e.g. moderate and/or severe dental fluorosis and crippling skeletal fluorosis). Where treatment to remove fluoride is practised, chemicals used should be of a grade suitable for use in drinking-water supply as outlined in the WHO Guidelines for Drinking-water Quality."
http://www.who.int/water_sanitation_health/publications/fluo...