Franz-Xaver Reichl studied Microbiology and Medicine in Munich, Germany. He is Head of the Department of Dental Toxicology at the Department of Operative/Restorative Dentistry, Periodontology and Pedodontics, LMU Munich and Head of the International Advisory Centre for the toxicology and biocompatibility of dental materials. His field of research cover studies on cytotoxic, mutagenic, carcinogenic and embryotoxic effects of chemical compounds (e.g. dental materials) in human and animal cells, abrasion of composites and elution of dental composite components during the chewing situation in the chewing simulator MUC/3 and in vitro- and in vivo studies on toxicokinetic and toxicodynamic effects of chemical compounds (e.g. dental materials). He also work on studies on the pathways and on the analysis of intermediates in the metabolism of dental composite components in biological systems and risk assessments of xenobiotics (e.g. dental materials). Michael Schwenk studied Biochemistry and Medicine in Tuebingen, Germany. He then qualified as a toxicologist and pharmacologist and worked in universities, industry and a health agency. He initially focused on experimental cell toxicology, but later shifted to the measurement of chemical residues in humans and to study the health effects of such exposures in different populations. He was active in various national regulatory committees, advised the colleagues of the public health service of Baden-Württemberg and received practical experience in all major areas of regulatory toxicology.