Sweden has a complete public oral hygiene system while there are still problems existing on young people which are caused by their individual habits. In the research, the main reason was found having connections with lack of daily tooth brushing. With the development design for behavior change, this research was trying to find how design can change when it was related to young people’s oral care behavior at home. As a result, a service design concluding a reward system was put forward to motivate young people to maintain a good tooth brushing habit.