Online registers contain a large amount of data about healthcare providers in the Czech Republic. Information is available to all citizens and can be useful to patients, governmental organisations or employers. Based on these data, we are able to create a high-quality snapshot of the current state of healthcare providers. Interconnecting data from more data sources together is an interesting task, and accomplishing it enables us to ask more complex questions. This paper focuses on answering several questions about dentists in our country. A dataset from one online database was created, using automated data mining methods and a subsequent analysis. Results are presented via an online tool, which was provided to owners of the data. They reviewed our results and decided to use our findings for the presentation to the Czech government and subsequent negotiation processes. Our paper describes used methods, shows some results and outlines possibilities for further work.