[Kies-voor-Tanden Study: caries among 17-year-olds in the Netherlands].

This fourth in a series of 5 articles in the context of the 2017 Kies-voor-Tanden study presents the results for 17-year-olds. 34% of the 17-year-olds had flawless permanent teeth. In 2017, there were still differences in oral health among the socio-economic groups, to the advantage of the high socio-economic group. The oral health of 17-year-olds had stagnated during the previous 6 years and even appeared to be deteriorating according to some indicators. In addition, knowledge about the dental insurance system after the 18th birthday was poor. Conclusion: The oral health of 17-year-olds had not improved in the previous years. This trend must be followed by monitoring research. In addition, interventions to improve the oral health, knowledge and behaviour of adolescents should be set up and evaluated.