Objective: To assess the effectiveness of an oral health intervention project in Oxapampa, Peru, from April to July 2023. Materials and methods: This longitudinal study involved 135 primary education students from the I.E. Bardo Bayerle educational institution. The research focused on two main variables: dental caries experience, measured using the DMFT index and dmft, and oral hygiene, assessed through the Simplified Oral Hygiene Index (OHI). Both descriptive and bivariate statistical analyses were conducted. Results: At the initial assessment, the OHI was 1.42 (SD = 0.68). By the conclusion of the study, this value had decreased to 0.45 (SD = 0.29), with the reduction being statistically significant (p < 0.001). Conclusion: Positive results were achieved in the oral health intervention project "Let's Smile Together" in Oxapampa, Peru, from April to July 2023.