Introduction:

the design of measuring instruments is a complex process that requires a rigorous preparation to obtain a test answering the demands generating its construction. Validity is a process that requires reliability, it is currently of great importance since it allows the elaboration of instruments that allow measuring parameters with greater veracity.

Objective:

to validate the content of instruments for evaluating oral health knowledge in preschool children, teaching staff and families.

Materials and methods:

an evaluative study was carried out during the time period 2017 - 2019. Interviews addressed to children and questionnaires to teaching staff and families, both instruments for measuring knowledge on oral health, were assessed: Content validation was performed using the Moriyama method and the Delphi technique.

Results:

the validation of the instruments showed that 100% of the questions were reasonable and understandable, sensitive to variations, with justifiable basic assumptions, with clearly defined components that are derived from data feasible to obtain. In the Delphi validation, 100% of the questions were evaluated with categories of very adequate and quite adequate.

Conclusions:

The evaluated instruments turned out to be reliable through content validity, which increases the rigor of the research process.

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