The pedagogical process in an educational institution is determined by the interaction of individuals. Therefore, the decisive factor in the professional development of a teacher is the ability to act as a subject of pedagogical activity and build dialogical interaction with other subjects. Dialogical interpersonal interaction is a prerequisite for the efficient pedagogical activity in an educational institution. In the process of mastering dialogical skills, the professional development of a teacher is ensured. A significant part of the teacher's professional competencies is associated with interpersonal communications, which focus our attention on the role of dialogical interaction in the professional development of a teacher. Pedagogical competencies are aimed at the implementation of professional activities and the ability to build competent dialogical interaction in the educational process. The optimal result of dialogical interactions is the mastering by the teacher of a certain set of knowledge, professional skills, and personal characteristics, which, in our opinion, could be considered as the criteria of professional growth. We believe that optimization of dialogical interaction between participants in educational relations requires special attention. In the educational institution, it is necessary to pay more attention to the implementation of the communicative potential of the individual, creating a comfortable educational environment for two-way communication. The communicative mobility of all subjects of interaction should be developed at pedagogical councils, training sessions, and parent-teacher meetings with the participation of a school psychologist.