Extended caries prevention programme with biannual application of fluoride varnish for toddlers: prevalence of dental fluorosis at ages 7-9 years and associated factors.

Objective: To investigate the prevalence of and factors associated with dental fluorosis in children living in areas of high caries risk in Stockholm and who had participated in a prospective, parallel, cluster-randomized, controlled caries prevention trial between ages 1 and 3 years.

Materials And Methods: The study group comprised a random sample of the children who had completed the 2-year prevention trial ( = 2536) in 2011-2014. All children were instructed to use fluoride toothpaste; the test group received fluoride varnish applications twice a year.