 The selected children will be randomly allocated into 2 groups. The control group will comprise cavities treated by ART, following the protocol proposed by Frencken and Holmgren 1999, while the experimental group will comprise cavities treated by HT, according to the guideline published by Innes and Evans 2011. The allocation of patients in each group will be carried out by a random list generated by a specific computer program. To ensure the allocation concealment, the sequence generated by randomization will be distributed in opaque, sealed envelopes, which will be opened by the operator during the treatment, only after the patient is ready to receive treatment. 