Endodontic treatment of primary teeth helps their existence in the dental arch until the period of the physiological exchange. The method of pulpectomy, as a radical approach, ensures a greater longevity of the tooth in the mouth. Besides the traditional paste of Zinc Oxide Eugenole, there were used three other pastes: Kri , Metapex and Endoflas for filling the canals of primary teeth.The most succesful paste and the one with less complications of near or far , resulted to be Endoflas. Endoflas consists of all the elements and ingredients ( ZnO , Ca(OH)2 , Jodoform ) of other pastes. This paste best fulfilled the requirements that,the materials used for the filling of the root canals of primary teeth, must meet.