After obtaining his Doctor of Dental Surgery degree, he worked as an assistant to the professor at the Departament of Periodontics and later Departament of Dental Surgeries at the Medical Academy of Warsaw. Dr. Darek Leszczynski completed multiple advanced trainings on implants, crowns and bridges, surgeries and restorative dentistry in Europe (Poland, Austria and Lichtenstain). After finishing qualifying program in 1998 he became a member of Canadian and Ontario Dental Association and has been involved in private practice setting since . His interest in implant and cosmetic dentistry led him to complete mini-residency program in implants at the UofT as well as other advanced trainings in various aspects of dentistry, so he can provide successful, long-lasting and natural-looking results to his patients.