This study focused on "gargling", one of the basic habits, based on children's daily circumstances and a database from their homeroom teachers and aimed to investigate methods of teaching in order to establish their basic habits. On conducting this research, the author had observed children's behaviors before teaching and focused on perspectives which seemed to be difficult. She taught how to gargle "spontaneously" and" in appropriate ways" making use of visual aids and notices. Then she recorded how the children changed their way of gargling from observation after teaching. As a result, it seemed that the children tried to change their behaviors after teaching thanks to teachers' plans of points which seemed to be difficult for children using teaching materials. They also succeeded in speaking to the children with words which praised more concretely based on how they have changed by observing and keeping records of them. In order to establish children's basic habits, it is important for teachers to teach and assist continuously.