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 in her general dental practice Mondzorgcentrum Nijverdal (The Netherlands) and participates in the Paediatric REsearch Project (PREP). She regularly writes articles on her research projects and she presents it at national and international conferences.