The aim of this work is to draw comparisons between the German political philosopher Hannah Arendt and the Spanish educator Jose Contreras on the proletarianisation and massification of teachers, in the sense of carrying out dialectical teaching, offering the student antagonistic nuances of providing subjectivist opinions, in both the acquisition of knowledge and the production of different opinions on the same subject to be debated, and how these concepts promote a loss of identity for the teacher as a reflective and interpretive professional about the different projections of teaching and learning acquired at different historical moments.