medical and dental defence union of scotland medical and dental defence union of scotland the medical and dental defence union of scotland (mddus) is one of three major medical defence organisations (mdos) in the uk and offers professional indemnity and expert medico-legal and dento-legal advice for doctors, dentists and other healthcare professionals throughout the united kingdom. mddus is a mutual organisation and was founded in 1902. it is recognised by the uk's general medical council. medical and dental defence union of scotlandmddus (the medical and dental defence union scotland) logo 2021foundedmay 1902 (1902-05) in glasgow, scotlandproductsprofessional indemnitywebsitewww.mddus.com at the university of glasgow, the mddus offers the "medical and dental defence union of scotland prize for medical jurisprudence" annually.