2. OBJECTS
Investigate the relationships between caries experience
and dental fluorosis at different fluoride concentrations in
drinking water
For set the most appropriate concentrtations for water
fluoridations of public policy
3. METHODS
Data from the 1986-87 National Survey of US School
children
- 4~22 years, 40693 childrens
- dental caries and dental fluorosis investigation
- dental history, using fluoride products
500ml water sample of surveyed school → fluoride level