Ongoing research techniques have made it possible to explore the structures of human cells, revealing the carriers of hereditary properties. Of many diseases and disorders the associated genes have been found. Internet offers the possibility of distributing this knowledge. There are 2 interesting websites on genetics, providing a lot of information on heredity and congenital disorders for dental practitioners. Erfelijkheid.nl is a Dutch website with general information on heredity. Genetics Home Reference is an extensive, well-structured English-language website, at which the subject is treated in detail.