Comparison of the cost effectiveness of fluoride varnish versus pit sealants and fissures in reducing the incidence of caries in children- A Randomized controlled clinical trial

INTERVENTION: Study setting – Elementary schools in Hidalgo State, Mexico. Randomization method‐ Using the random number function excel. Intervention ‐ Group 1 ‐ Sealants of pits and fissures. Application of sealants of pits and fissures will be made through the total‐etch technique Group 2 ‐ ‐fluoride varnish. Application of varnish of fluoride by through prior prophylaxis and use of micro brush. ‐ The application for the varnish will be carried out every three months and the application of the sealants will only be carried out if necessary. CONDITION: Oral health, Caries. PRIMARY OUTCOME: The incidence of caries as measured by using the visual method and the measurement system will be ICDAS. ICDAS: International Caries Detection and Assesment System [6 months, 1 year]; SECONDARY OUTCOME: Cost of each intervention ; The cost will be measured as follows: ; 1. Total cost of each intervention ; 2. Time needed for each application ; 3. Number of times that requires reapplication. ; ; [6 months, 1 year]; INCLUSION CRITERIA: • Children between 6 and 8 years of age. • Have at least one permanent first molars healthy and totally erupted. • That belong to the selected school. That their parents accept and sign the informed consent. • The children allow oral exploration and application of sealants.