IRCT20210718051926N1 IRCT 2021-08-15 Zanjan University of Medical Sciences pH in children Comparison of the effect of fluoride varnish with silver diamine fluoride on oral pH in the period of primary teeth in children with Sever-Early Childhood Caries (S-ECC) 2021-08-20 anticipated 38 Complete https://irct.ir/trial/57570 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Randomization description: Samples will be assigned to two random groups using the random number generation method by Random Number Generator software. In this way, random numbers in the range (0,1) will be generated in the software and numbers less than 0.5 will be assigned to the SDF group and numbers greater than 0.5 to the NaF group (and vice versa). 3 dental caries. Intervention 1: Intervention group: Silver diamine fluoride will be used once. Then at 5, 10, 20 and 30 minutes after the intervention, children's oral pH will be measured using pH paper. Intervention 2: Control group: fluoride varnish will be used once. Then at 5, 10, 20 and 30 minutes after the intervention, children's oral pH will be measured using pH paper. Yes - There is a plan to make this available What will be shared: The complete data file includes personal information such as gender and age and study information such as the type of intervention and the measured outcomes of the final outcome. When: The results and the resulting article can be shared immediately after publication. To whom: All people Conditions: Mentioning the source and the city and the people who did the work, any analysis is allowed. Where to obtain: seyede solmaz taheri: solmaz.taheri.1990@gmail.com: 09191439740 bahareh nazemi salman: dr.b.nazemi@gmail.com: 09123777185 How to obtain: In case of phone call or e-mail and explaining the reason for requesting the data and guarantee for future reference, the data will be sent at the earliest opportunity. Of course, provided that the preliminary results are published Comments: