Short and long effects of the COVID‐19 context on oral health‐related quality of life of adolescents

To assess the immediate and late effects of the COVID-19 pandemic on the oral health-related quality of life (OHRQoL) of adolescents.This is a longitudinal study performed with adolescents (11-15 years old) from Southern Brazil who were evaluated before the COVID-19 outbreak, and 3 (T2) and 15 (T3) months after the beginning of the pandemic. OHRQoL was assessed using the CPQ11-14. Sociodemographic and clinical variables were also collected. Changes in OHRQoL before, 3 and 15 months after the start of the pandemic were analyzed through multilevel Poisson regression models for repeated measures.A total of 290 adolescents were evaluated at T1, 207 were re-evaluated at T2, and 204 at T3. Overall CPQ11-14 scores over follow-ups were 11.0 (SD 8.0) at T1, 8.3 (SD 7.8) and 12.8 (SD 8.8) at T3. Compared to T1, adolescents presented 29% lower overall CPQ11-14 scores (IRR 0.71 95% CI 0.66-0.75) at T2, and 11% higher scores at T3 (IRR 1.11 95% CI 1.05-1 0.17), especially for the emotional and social well-being domains.COVID-19 pandemic impacted the adolescents' OHRQoL differently over time, indicating a reduction in impacts immediately after the beginning and worsening over long term exposure to this scenario.