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3. aks Zahnprophylaxe GmbH Data for the school year 2005/2006 www.maxprophylax.com
4. Prevention of early childhood caries - a review of literature published 1998-2007;Twetman;Eur Arch Paediatr Dent,2008
5. Preschool caries as an indicator of future caries: a longitudinal study;Peretz;Pediatr Dent,2003