Alexandra Efthymiou initially qualified from Aristotle University, Thessaloniki, in 2002 before obtaining a postgraduate qualification in Restorative & Paediatric dentistry and working for a short while in the Dental department at 'Ιπποκράτειο' General Hospital of Thessaloniki.

In 2004 she moved to London, UK to specialise in the field of Periodontology and Implantology at the Eastman Dental Institute, UCL (University College London). UCL is worldwide renowned, while Eastman Dental Institute is considered one of the best postgraduate centers in dentistry, especially in the field of Periodontology & Implantology. Moreover,this 3-year postgraduate course is the only one accredited by the European Federation of Periodontology in the UK.

As an acknowledgement of the high level of knowledge, skill and understanding of the subject, Alexandra was registered in the UK Specialist List of Periodontics. These specialty lists are indicative of outmost recognition and are very selective as they include individuals highly specialised for minimum 3 years in the related field, among other prerequisites and only upon successful outcome of additional specific examinations.

From 2007 till 2012 she has worked at various practices all over the UK as an external associate as well as at the Eastman Dental Hospital of UCL, her practice being dedicated to periodontology and implantology. Throughout this period she gave various presentations and seminars on relevant topics of her field.

She was also employed in the position of Clinical Teaching Fellow in the Department of Periodontology of Eastman Dental Institute, UCL. She was mainly responsible for the organisation and execution of a new continuing education programme in Periodontology and Implant Dentistry for general dentists (Implant Mentoring Scheme). In addition, she was also responsible for the clinical supervision of the postgraduate students in their interaction with a variety of non-surgical and surgical treatment.

She now runs her own private practice PerioDental in Thessaloniki, whilst continuing to offer her services professionally in the UK, dedicated to Periodontology & Implantology.