They had a low-fear population, where they basically gave them a 13-minute presentation, all based in science, but told them that, if you didn't brush and floss your teeth, you could get gum disease.
Tenían la población de poco miedo, a la que basicamente le dieron una presentación de 13 minutos, todo basado en la ciencia, pero les dijeron que, si no se cepillaban lo dientes, les podría dar gingivitis.