The 2021-2022 school year will go down in history as a very different and slightly strange year. Due to the COVID-19 pandemic that began in March 2020, schools had to change the way they taught.

Initially, the classes stopped being face-to-face to become virtual classes. But pressure from civil society drove schools back into buildings even though the pandemic was still a threat. This is how masks became the most important school supply for students and the most effective teaching tool for teachers. Sonrisas ocultas is a book that tells some of the stories that the pandemic left in schools around the world.