The MHC Database is a national database for documentation of orofacial manifestations in rare diseases. The purpose of the database is to document, analyze and present how oral health, craniofacial morphology and orofacial function can be affected by various rare diseases. We collect data on rare diseases through clinical observations and information from parents. The MHC Database was established in 1996, and is under constant development.
According to the Swedish National Board of Health and Welfare, a disease is defined as rare when it affects fewer than 100 individuals per million population and leads to a marked degree of disability.