The purpose of this article is to highlight the factors that decisively affect the effectiveness of the teacher in fulfilling his role, giving special importance to his pedagogical and didactic training. Initially, the role of the teacher is approached in relation to the mission of the school and the characteristics of an effective teacher. Subsequently, the content and the importance of pedagogical and didactic training for the exercise of the educational work are approached, as well as the additional reasons that impose it. In addition, the existing pedagogical and didactic training of current teachers is approached, in relation to the consequences of its absence for the educational process and the student. The article concludes with the final findings and remarks.