Dentists randomised into the intervention group will participate in a complex small group educational seminar that aims at : increasing knowledge on bacterial resistance , pharmacology , and prophylaxis of infectious endocarditis ; increasing awareness of dentist-patient communication using video-taped vignettes of dentist-patient communication on antibiotic treatment ; improving collaboration between general dentists , general practitioners , and practice-based cardiologists on the necessity of antibiotic prophylaxis ; enhancing awareness of the dentists ' own prescribing habits by providing antibiotic prescribing feedback ; and increasing patient knowledge on antibiotic treatment by providing patient-centred information material on antibiotic prophylaxis of endocarditis .