Problems of Dental Medicine is a peer-reviewed dental journal, published once a year (each paper will be published upon approval) by Faculty of Dental Medicine, Medical University of Sofia. Paper-based at the beginning, it is now available also in an electronic version. Issued exclusively in English, Problems of Dental Medicine publishes review articles, original research papers, rapid communications, brief reports, case reports, and letters to the editor. Received manuscripts are accepted for publication only after they have been rigorously reviewed by independent experts in the respective fields determining the originality, validity and conclusions, the reviewers remaining anonymous to the authors. The journal is published under the strict supervision of an Editorial Board.