Dr. Vrettos graduated from the School of Dentistry at the University of Athens to receive his DDS title in 2007. In 2010 he was admitted to the University of Michigan, School of Dentistry, in the U.S.A., where he successfully completed his 3-year postgraduate training in Prosthodontics. He received his specialty degree along with the Master of Science degree in Prosthodontics. In 2013 Dr. Vrettos worked at the University of Michigan as a lecturer, teaching fixed and removable prosthodontics.

Dr. Vrettos has participated in many international conferences, and he is currently a scientific associate at the Dental School of Athens.