Professor Testarelli is Associate at the 1st Faculty of Medicine and Surgery of the University of Rome “La Sapienza” since 2006. Dentist in Dental Clinic of Policlinico Umberto I’s Hospital of Rome since 2011. He completed a Ph.D with the highest marks at the University of Rome “La Sapienza” (2004) and obtained a Specialization Diploma in Orthognathodontics, at the University of L’Aquila (2008). Professor Testarelli is a member of several scientific national and international societies, in particular of the European Society of Endodontology (ESE), Active member of Accademia Italiana di Endodonzia (AIE), and Active member of Società Italiana di Odontoiatria Conservatrice (S.I.D.O.C.) and member of several dental scientific journals editorial boards. He is also Professor of Dental Restorative and Endodontics in the School of Dentistry in Sapienza University of Rome, Professor of Oral Care in School of Dental Hygienist in Sapienza University of Rome and Professor of PhD Dentistry in Sapienza University of Rome.

He is also certified as Visiting Professor Faculty of Dental Medicine, University of Medicine, Tirana; Distinguished Adjunct Professor in the Department of Prosthodontics and Implantology Saveetha Dental College & Hospitals Saveetha Institute of Medical And Technical Sciences, Chennai India;  Adjunct Professor in the field of Endodontics and Restorative Dentistry AB Shetty Memorial Institute of Dental Sciences, A Constituent College of Nitte, Deemed to be University, Mangalore, India; Adjunct Professor in the field of School of Dental Sciences at KVV Karad. KIMS, Karad, Maharashtra, India.