Critical thinking has been developing since ancient times, and the first most significant proponent of questioning is Socrates, who believed that it was necessary for the soul. Everything starts with asking questions. Defining critical thinking is not an easy task due to the complexity of the term, and many philosophers and experts have given their own definitions. Given that it is a very important skill that an individual can possess, i.e. it would be better to say that one can live by it, it is necessary to develop it from a young age. The role of teachers in encouraging the development of critical thinking in children is extremely important, and teachers should guide them towards effective communication, problem-solving skills, openness to dialogues and self-reflection. For the purposes of this guidance, there are methods of promoting critical thinking that all teachers need in order to make students successful critical thinkers. The methods used in philosophy for children and the methods according to the ERR system prove to be successful tools that teachers can use in teaching. The problem of integrating critical thinking into the educational system arises from the question of how it should be integrated, as a special educational area or should it be integrated into existing educational areas. The role of teachers in developing critical thinking in children is also a part of the problem that experts deal with. The influence teachers have on students is something that should not be ignored and should be used in attempts to develop critical thinking in children. We want to create people from students who, as part of society and for social progress, can and know how to evaluate, analyse information, carefully examine their beliefs, reflect reflexively on their opinions and actions, and most importantly, accept their mistakes and work on their correction. In order to achieve this, it is necessary to start developing critical thinking from an early age. Classroom teaching is the first step in the education system, in primary school, and children should be taught how to think critically from the first grade. The methods used for such development can be adapted to the age of the children by adapting the topic to the students' immediate experience. Thinking critically should become imperative in today's modern education.