Speech performs an important function in the life of any human being. Apart from communicative function it has a key meaning for the empirical and social development. A teacher must be, above all, the role model for the correct speech. The presented article discusses the features that any teacher’s speech ought to possess. Conditions of appropriate voice emission and the principles of voice hygiene were elaborated on. The subsequent part contains the most frequently occurring speech disorders and their consequences. The attention was paid to the fact that speech disorders may be the cause of difficulties at school which most often are noticeable within difϐiculties in reading and writing. Subsequently, tasks of a teacher when it comes to children with speech disorders were discussed, considering preventive actions.