IRCT20200727048218N1 IRCT 2020-11-23 Tehran University of Medical Sciences Comparison of the effect of fluoride varnish with silver diamine fluoride on children's teeth Comparison of the effect of fluoride varnish with silver diamine fluoride on oral pH in the period of primary teeth 2019-12-24 anticipated 18 Complete https://irct.ir/trial/50055 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Prevention, Randomization description: The samples are divided into two equal groups using randomization with six random blocks with the help of Excel software. In each block, three samples are placed in group A and three samples in group B and the randomization process is studied by the methodology consultant. Done and researchers are conceal of it. N/A Condition 1: PH of children's mouths. Condition 2: Silver diamine fluoride. Intervention 1: Intervention group: Intervention group: The samples are randomly divided into two groups and the first group is given 5% fluoride varnish (V-varnish / Korea / fluoride varnish / 0.4 ml) with V-varnish brand. Immediately after fluoride varnishing, then 5 minutes later, after 10 minutes, after 20 minutes and after 30 minutes using oral pH meter paper, the pH of the mouth is measured and recorded. Intervention 2: Intervention group: For the second group, silver diamine fluoride 30% (SDF) (cariestop30% / Iran / biodinamica / ml5) is used. Immediately after SDF application, 5 minutes later, after 10 minutes, after 20 minutes, and after 30 minutes, the pH of the mouth is measured and recorded using pH meter paper. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no more information.