This study investigates whether the oral health of 5- and 11-year-old children of immigrants from Turkey and Morocco is worse than that of Dutch peer groups in Amsterdam. The outcome variables considered were dmft/s. DMFT/S and the index-components, amount of plaque and number of tooth surfaces sealed (only 11-year olds). The explanatory variable considered was ethnicity (Turkish, Moroccan, Dutch, Surinam and 'Others'). The mean dmfs-score of Turkish and Moroccan 5-year olds was significantly higher than that of Dutch children: 8.1 and 8.2 vs. 3.6, respectively. Also a significant difference in mean DMFS-score between Turkish and Dutch 11-year olds was found; 3.3 vs. 1.7, but not between Moroccan and Dutch children. On average 1.8 surfaces were found sealed in 11-year olds. The mean plaque scores observed in Turkish and Moroccan five- and 11-year olds was significantly higher than in Dutch children. It was concluded that the oral health of Turkish and Moroccan children in Amsterdam was worse than that of their Dutch peer groups and that programs should be developed aimed at improving this situation.