Caries-preventive effects of daily and weekly fluoride mouthrinsing in an optimally fluoridated community: findings after eighteen months.

Two groups of children, beginning in the seventh grade, rinsed their rnouths at school either once a week with a 0.2 percent solution o£neutral sodinm fluoride or once a day with a 0.05 percent neutral sodium fuoride solution. A control group of children fo]lowed the procedure once a week using a placebo mouthrinse. Results after 18 months showed that both fuoride rnouthrinse procedures effectively reduced the incidence of dental caries. The reductions in cat~es were in adch’ton to those already accrued from consuming optimally fluoridated dn’nldng water.