Until recently, the problem of contamination in dental medicine, with all related clinical entities, was mainly summarized in infections with anaerobic germs. The emergence of new infectious manifestations, especially viral, emphasized the potential existence of a wide variety of microorganisms in blood or saliva. For dentistry, the major difference is not in properly sterilizing or decontaminating, but in maintaining proper asepsis throughout the working day throughout the operative act. The increase in the risk of airborne contamination in the dental office, as well as the appearance of new viral diseases for which current treatments are insufficient, require a change of mentality in dental practice.The dentist is obliged to equip himself with appropriate means of prevention and to organize his activity in such a way as to minimize the degree of infection of the office and implicitly of the patients.