“…In the present study, the validity of the data collected by inspecting the vaccination cards and laboratory exam reports allowed adhesion to the vaccination measures to be known, without the possibility of response and memory biases resulting from the use of self-applicable questionnaires, because this was a documentary research. In the majority of studies in the literature, the data result from self-applicable questionnaires that depend on the participant's memory 1,5,[14][15][18][19][20] . In practice, it was only possible to carry out this inspection due to the dental school's demand that students had to hand in a copy of their vaccination card and anti-HBs exam result to the undergraduate course secretariat, so that these could be evaluated, and later attached to the documents of each student.…”