Marlies Elfrink studied dentistry at the Radboud University Nijmegen, and followed the master program in paediatric dentistry at ACTA (Academic Centre for Dentistry Amsterdam), the Netherlands. In 2012 she received her PhD for her research on Hypomineralised Second Primary Molars (HSPM). Nowadays she works as a paediatric dentist in clinical practice and participates in the Paediatric REsearch Project (PREP). She regularly writes articles on research projects and she presents it at national and international conferences. She is section editor (developmental defects) of the Eur Arch Paediatr Dent. She is a member of the science committee of the NVvK (Dutch association of Paediatric Dentistry) and IAPD and participates in guideline development in the Netherlands.