topical agents used in chemo-mechanical removal of caries.

children included in the trial will be divided into three groups: Group A: Sodium hypochlorite gel. Group B: BRIX 3000 gel. Group C: conventional drilling. the method of application of chemo-mechanical gels: teeth will be selected randomly and they should be primary molars which have a cavitated proximal or occlusal caries with no proximity to pulp. The procedure will be performed without anesthesia, the teeth will be dried, following the principles of Atraumatic Restorative Treatment (ART). and the gel will be applied by a dentist in an amount of half a grain of rice as mentioned by the manufacturer of BRIX 3000. the application will be with a #2 dentin excavator, leaving it to act for 2 minutes , following the BRIX 3000 manufacturer’s instructions.The infected tissue was then removed through curettage, first at the surrounding walls, using a #2 dentin excavator followed by pulpal wall. the cavity will be washed and dried thorougly. then, caries detector dye will be applied with a microbrush to detect any carious dentin still present. if any carious tissues will be detected, reapplying of the gel will be considered. A timer will be switched on at the moment of gel application and it will be switche off whenever all caries will be removed to record time needed to remove caries in minutes. The whole application will be done by a pedodontist who is available to help researchers and he will monitor the whole procedure. Immediately after the treatment, the child will be questioned about the discomfort with the performed procedure using the Wong-Baker face scale. The child will be instructed to point to the picture that represents his level of discomfort after the following question: what did you feel during treatment? All teeth will be restored with restorations according to the remaining dental structure.