This document outlines a research plan to study the effectiveness of dental fissure sealants in preventing cavities among New Zealand children. The study will analyze dental records of 200 children aged 6 from each health district, comparing cavity rates between those who received sealants and those who did not. Dental therapists will collect data and check each other for errors. Analysis will include frequencies of cavities in sealed vs. unsealed children and comparisons between variables. The goal is to identify sealants' effectiveness against cavities in New Zealand and inform decisions around sealing practices and resource allocation.