DentSim is a revolutionary computerized dental training system developed by joint contributions from companies in Israel and America. It is a high-tech unit developed from the classic dental simulator. Not only can this system standardize and improve the students' dexterity, but also does the training module make preparations easier to be visualized and provide immediate feedback, real time user-generated evaluation by using advanced imaging and simulation technologies via the built-in 3D scanning system. Since the debut of the first generation product in 1993, and throughout consistent practice and refinement over many years, the fourth generation system is now available and utilized by many schools of stomatology worldwide. DentSim has become an important teaching modality in the preclinical training of dental students.