About our doctors
Dr Ivelina Ivanova-Koycheva
Orthodontist (MSc), Lozenets clinic
Dr Ivanova-Koycheva graduated in dental medicine from the Medical University of Sofia. She received the "2nd Level University Master in Orthodontics" from the university in Rome, Italy, "Saint Camillus International University of Health and Medical Sciences". This followed the successful defence of her dissertation on distalisation appliances, which she prepared under the academic supervision of Prof. Mauro Cozzani (former President of the European Board of Orthodontists and the Italian Board of Orthodontics, and 2022 President of the Italian Society of Orthodontics (SIDO – Società Italiana di Ortodonzia)).
She earned the Master's degree "2nd Level University Master in Aligner Orthodontics" at the prestigious University of Turin, Italy. Founded in 1404, the university is one of the leaders in modern dentistry.
Dr Mariyan Neychev
Dentist, Lyulin clinic
Dr Mariyan Neychev graduated from the Faculty of Dental Medicine at the Medical University of Sofia. He has a strong interest in aesthetic restorative dentistry. In his daily practice, Dr Neychev most often treats cases in cariology, endodontics, periodontics and children's dentistry.
He has attended a number of lecture and hands-on courses in aesthetic dentistry and endodontics in Bulgaria and abroad, led by Dr Marko Jakovac, Dr Marga Ree, Dr Milen Dimitrov, Jan Bergmans and others. Some of the most recent are:
Dr Izel Yumer
Orthodontist (MSc), Lozenets clinic
Dr Izel Yumer loves delighting her patients with new smiles. Whether she is treating children or adults, her aim is to make the journey to a beautiful smile easy and memorable. She earned her Master's degree in Dental Medicine from the Medical University of Sofia, graduating among the top students of her year. She is a full member of the Bulgarian Dental Association, the Italian Society of Orthodontics (SIDO) and the Eurasian Association of Orthodontists. Dr Izel Yumer is fluent in four languages.
Dr Yumer is an orthodontist (MSc): she completed a Second Level Master in Contemporary Orthodontics at the University of Naples Federico II, Italy, and is now specialising in Ferrara, Italy. She continues to develop in orthodontics by attending training in Bulgaria and abroad and takes part in scientific congresses every year, so that she always keeps up with the latest developments in orthodontics. Dr Yumer has attended many courses led by Prof. Ravindra Nanda, one of the most important and best-known orthodontists in the world.
Dr Velina Klimovich
Dentist, orthodontics, Lozenets clinic
Dr Velina Klimovich firmly believes that a healthy and beautiful smile is the foundation for a better quality of life. She graduated in dental medicine from the Medical University of Sofia as one of the best in her year. She specialised in orthodontics with a Master of Science in Orthodontics at the Universidad Católica San Antonio de Murcia (UCAM) in Spain. She is a full member of the Bulgarian Dental Association. Her main professional interest is orthodontics.
In 2026 Dr Klimovich attended the SIDO International Orthodontic Congress in Turin, Italy. The theme of the congress was “Beyond Alignment: Interdisciplinarity, Artificial Intelligence and Clinical Expertise in Orthodontic Decision-Making”.
Dr Deniz Asadpur
Orthodontist (MSc), Lozenets clinic
Dr Deniz Asadpur is convinced that by transforming her patients' smiles, she gives them not only healthy teeth but also more confidence and joy in life. She graduated among the top students of her year from the Faculty of Dental Medicine at the Medical University of Sofia, and in 2023 she joined the iSmile Dental Clinic team. Dr Asadpur is an orthodontist (MSc): she completed a Second Level Master in Contemporary Orthodontics at the University of Naples Federico II, Italy.
Dr Asadpur also holds a master's degree in Public Health and Health Management and is a PhD candidate at the Faculty of Public Health of the Medical University, Department of Health Management and Health Economics.
Dr Hristiana Borisova
Dentist, orthodontics, Lozenets clinic
Dr Hristiana Borisova is a dentist who graduated from the Medical University of Sofia among the top students of her year. Her professional interests focus on modern developments in orthodontics for children and adults.
She is specialising in orthodontics on the master's programme in Advanced Orthodontics at the University of Naples Federico II, Italy.
Dr Yoana Karadzhova-Kirova
Dentist, orthodontics, Lozenets clinic
For Dr Yoana Karadzhova-Kirova, a perfect smile is a combination of precise science, digital innovation and an individual approach to every detail. In her work she combines modern orthodontic technology with minimally invasive methods to ensure maximum comfort and predictable results.
Dr Nadezhda Dimitrova
Dentist, orthodontics, Lozenets clinic
Dr Nadezhda Dimitrova believes that every patient who walks into our clinic deserves a personalised approach to comprehensive treatment that meets their unique needs. At iSmile, Dr Dimitrova works in orthodontics, as well as endodontics and aesthetic restorations. She graduated in dental medicine from the Medical University of Sofia at the top of the class of 2019. She is a full member of the Bulgarian Dental Association, the Italian Society of Orthodontics (SIDO) and the Eurasian Association of Orthodontists. Dr Dimitrova is fluent in English and Spanish.
She has attended courses on root canal treatment (devitalisation) of teeth, their subsequent restoration, and aesthetic restorations with composite:
Dr Nikolay Dochev
Dentist, Lozenets clinic
Dr Nikolay Dochev graduated as a Doctor of Dental Medicine from the Medical University of Sofia. He has a special interest in restoring the natural smile and maintaining periodontal health. That is why in 2025 he began PhD studies at the Department of Periodontology of the Medical University of Sofia. He believes that effective communication and understanding each patient's individual needs are essential for successful treatment. He also has a special interest in aesthetic restorations.
Committed to providing high-quality dental care that combines scientific knowledge with modern techniques, he has attended a number of courses, including: