Dr Flynn qualified in 2002 from Trinity College in Dublin. After this, he spent a year at Dublin Dental Hospital as a House Officer, where he concentrated on both oral surgery and restorative dentistry.
Dr Flynn then worked for over two and a half years in private dentistry, completing his MFDS examination in the process. Following this, he studied a three year Endodontics programme at the prestigious Eastman Dental Institute, where he now teaches, as well as providing lectures and hands-on courses for general dentists to improve their skills in endodontics. He is on the specialist Endodontics register of the General Dental Council