 The test panel will be recruited from the dental students of the Lutheran University of Brazil, Canoas, Rio Grande do Sul, Brazil. At recruitment, subjects will be asked about their medical and dental history. Written and oral explanations detailing the study purpose and design will be given for each subject. Subjects that preliminarily met inclusionexclusion criteria will be selected for a dental screening appointment. If the subject met all the inclusionexclusion criteria, an informed consent was handed out and, upon acceptance, signed by the volunteers. 