The traumatisms of primary teeth have often sequels thereabouts grave on the germs of their successional permanent teeth. They have many causes but they are above all frequent during the child's walking trial. We have carried out a clinical and radiographic study of some cases. The study has ascertained the fact that the diversity of the sequels and their gravity depend on the age of the occurring of the traumatism, the intensity and the direction of the shock. The therapeutic and preventive management of these traumatisms and their possible sequels use a pluridisciplinary protocol based on the strict application of indicated treatments, the clinical and radiographic regular follow up and the adoption of a rigorous preventive attitude by the parents during the target period of walking trial.