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To describe the caries lesion transition pattern in permanent tooth surfaces over 2years among a convenience sample of children in a fluoridated (0.8ppm F) low-socioeconomic community of Brazil. One hundred forty-nine schoolchildren (7-12years) were examined for caries using Nyvad criteria at baseline and after 2years. Descriptive analysis was used to evaluate caries lesion transition patterns. Less than 1% of sound surfaces and non-cavitated caries lesions at baseline progressed to cavitation stage within 2years. 12.7% of the active n