Lars Bjørndal (born 1963) graduated in 1988 as a dentist from the University of Copenhagen, Denmark. In 1992: Ph.D. thesis on the topic: Caries progression in enamel and the pulp-dentin organ using thin undemineralized tooth sections. In 2011: Dr. Odont. Thesis entitled: Endodontic treatment: reason, prevention and quality – shaping factors. From 1993-1998: Assistant professor at the Department of Cariology and Endodontics, University of Copenhagen. 1999-2001: Received specific postgraduate endodontic specialist courses in collaboration with the universities in Copenhagen, Denmark, Malmö and Gothenburg, Sweden. From 1998: Associate professor at the University of Copenhagen, Denmark, and Head of Endodontic. In 2012 LB was visiting Scholar at Loma Linda University, US. From 2012: Head of the Special Clinical Unit receiving referrals at the Institute of Odontology, University of Copenhagen, Denmark. One day weekly he is in in private practice devoted endodontic referrals. He has been Secretary in the Scandinavian Endodontic Society (SES) from 1999-2001. In 2007 and 2016 He hosted the SES biennial congress in Denmark. He is second time President of the Danish National Endodontic Society (2014-), and country representative for the European Society of Endodontology (ESE), as well as a certified member of ESE. Besides numerous national post-graduate General Dental Practitioner courses covering endodontic treatments, He has been giving lectures in Europe, Asia, North and South America, and the topics have been within the field of deep caries lesion pathology, treatments and quality-shaping factors concerning endodontic treatments. He has authored and co-authored numerous international and national articles, including book chapters and reviews, and is at present reviewer in several international Journals. Editor of Textbook of Endodontology, WiIey ,Blackwell 3. edition.