 Operators will be two undergraduate students in dentistry and one experienced specialist in pediatric dentistry that will be trained on how to prepare and fill the cavities according to the original procedures of ART Frencken and Holmgren, 1999 and also according to HT Innes and Evans, 2011. The training will include a lecture about the techniques used in this study, as well as a workshop held in the laboratory for students to train handling and application of treatments to be tested. They will also undergo a week of training with patients, to apply the different techniques before starting the study, the latter phase held at the Faculty of Dentistry, University of São Paulo, under the supervision of an experienced dentist in ART and HT. 