Which monitoring scheme most effectively balances the benefits of community water fluoridation and salt iodization while guarding against local increases in fluorosis and iodine excess?

Rely exclusively on self-reported salt brand use in surveys to infer both fluoride and iodine exposure because laboratory measures are unnecessary and unreliable.

Conduct yearly mass screenings for bone stiffness in all adults as the single most sensitive indicator of both fluoride and iodine overexposure, and ignore dental outcomes.

Only monitor iodine in urine of adults because children and pregnant women are unaffected; fluoride need not be measured since cosmetic fluorosis is not a public-health concern.

Regular measurement of fluoride in water supplies and dental fluorosis surveillance in children, combined with periodic population iodine status surveys and targeted education on supplement use in pregnancy.