Mas received his Bachelor of Dental Surgery (BDS) in 2009 from King's College London. Following this, Mas obtained a membership in endodontics from the Royal College of Surgeons of Edinburgh, which is recognised as the highest qualification available within the specialty.

After one year of vocational training, Mas worked as a senior dental officer in the oral and maxillofacial surgery department of John Radcliffe Hospital, Oxford, where he treated medically compromised patients with oral cancer, facial trauma and craniofacial deformities. Mas also spent six months in the oral surgery department, where he furthered his skills in complex tooth extractions and other minor oral surgery procedures. This was followed by three years of general dental practice in Australia and the UK, where he developed a keen interest in endodontics. In 2013, Mas entered a specialist training programme in endodontics at the world-renowned Eastman Dental Hospital. Following successful completion of his specialty programme, Mas was awarded a master's degree in clinical dentistry (MClinDent) in the field of endodontology. He welcomes referrals for all forms of endodontic treatment and diagnosis. He has a particular interest in management of heavily broken down teeth and complex restorative cases.