“…These stages are (1) introducing the problem, (2) determining the needs, (3) developing solution suggestions, (4) choosing the best solution, (5) making the prototype, (6) testing and evaluating the solution, (7) presenting the solution, (8) redesign and (9) completion of the design. When the studies in the literature on STEM education are examined, it is seen that there are many activities developed and implemented according to EDP (Aydın and Karslı-Baydere, 2019;Eroğlu and Bektaş, 2016;Gökbayrak and Karışan, 2017;Karslı-Baydere and Kurtoğlu, 2019;Tarkın-Çelikkıran and Aydın-Günbatar, 2017;Yıldırım and Altun, 2015;Yıldırım, 2017). However, no study has been found to develop a design to prevent tooth decay in the teaching of the topic "bacteria and dental health", which is one of the problems of our daily life and which concerns us all.…”