BACKGROUND Tooth discoloration, which is often considered as a deviation from the beauty standards, is one of the significant factors that can affect an individual's mental health and well-being. Therefore, determining the relationship between tooth discoloration, its aesthetic treatment and mental health can provide answers for the improvement of treatment services. METHODS The present study is a cross sectional study. 96 participants meeting the inclusion criteria were assessed via demographic characteristics form and a standardized Goldberg’s general health questionnaire (GHQ) - 28 before starting the treatment. Following the assessment, a standard bleaching protocol was followed. Two weeks after the completion of the treatment, the patients were re-assessed using the same questionnaire. The data obtained were analyzed using the statistical package for social sciences (SPSS) software. The analysis was performed using descriptive statistics and chi square test for correlation analysis. Wilcoxon sign rank test was used to compare the scores before and after the intervention. RESULTS Higher GHQ scores were associated with younger age groups, females, unmarried persons, and lower education levels. The participants mainly showed higher mean social dysfunction scores (17.7), followed by anxiety scores (12.2) compared to somatic (7.7) and depression scores (4). The mean total GHQ scores were significantly decreased after aesthetic intervention. The mean GHQ scores were reduced from 42.5 before the bleaching treatment to 21.4 post-treatment. CONCLUSIONS Tooth discoloration showed a significant impact on mental health, mainly affecting the social functioning and the anxiety of the individuals. Tooth discoloration has a significant impact on the mental health in younger age groups, females, unmarried persons, and education status. The aesthetic intervention had significantly improved the overall mental health of the individuals. KEYWORDS GHQ, Mental Health, Tooth Discoloration