Associations between Anxiety, Depression, Chronic Pain and Oral Health-Related Quality of Life, Happiness, and Polymorphisms in Adolescents' Genes.

Adolescence is marked by changes and vulnerability to the emergence of psychological problems. This study aimed to investigate associations between anxiety/depression/chronic pain and oral health-related quality of life (OHRQoL)/happiness/polymorphisms in the , and genes in Brazilian adolescents. A cross-sectional study was conducted with ninety adolescents 13 to 18 years. Anxiety, depression and chronic pain were evaluated using the RDC/TMD. The Oral Health Impact Profile was used to assess oral OHRQoL. The Subjective Happiness Scale was used to assess happiness. Single-nucleotide polymorphisms in (rs165656, rs174675), (rs6313, rs4941573) and (rs1360780, rs3800373) were genotyped using the Taqman method. Bivariate and multivariate logistic regression analyses were performed ( < 0.05). Chronic pain and depression were associated with feelings of happiness ( < 0.05). A significant inverse association was found between anxiety and OHRQoL ( = 0.004). The presence of minor allele C of rs174675 was significantly associated with depression ( = 0.040). Brazilian adolescents with depression and chronic pain considers themselves to be less happy than others and those with anxiety are more likely to have a negative impact on OHRQoL. Moreover, the rs174675 variant allele in the gene was associated with depressive symptoms in Brazilian adolescents.