Tooth decay is the most widespread, chronic childhood disease and often requires extensive and costly repair. The use of fluorides, both ingested and applied directly to the teeth, helps prevent tooth decay. The Ohio Department of Health (ODH) sponsors a school-based fluoride mouthrinse program, targeted to elementary schools in nonfluoridated communities. In 2010-11, about 30,400 students at 134 schools participated. With parental consent, children rinse with a 0.2 percent solution of neutral sodium fluoride for one minute each week.