A system (100) and a method for multi-person and multi-site, interactive simulation of a dental treatment are described. Over a communications network (40) the system (100) allows a group of dental specialists (201, 202) to provide advice on dental treatment to be administered on a patient by a dentist (101, 102). Treatment can be simulated by treatment simulation software. An advantage of the system (100) is that any number of specialists (201, 202) can be involved in to instruct the dentist (101, 102) via treatment simulations while the dentist (101,102) can focus on administering the treatment.