Dental caries is one of the most common oral health problems that mainly affects children and young people of school age, altering the general health and quality of life of people, thus becoming a public health problem. Objective: The aim of this study was to obtain the incidence of bad oral hygiene related to mood in 12-year-old school children in the parish of San Sebastián, Cuenca-Ecuador. Methods: For this study, a quantitative approach was used, from a descriptive study, where 281 twelve-year-old school children were analyzed. Results: By means of the Kendall analysis method applied to the CPOD and mood limitation variables, the results were 0.987 in the female gender and 0.304 in the male gender. Conclusion: No relation between CPOD level and mood was found