TDI was better explained by individual factors, related to sociodemographic conditions and occlusal problems, with a negative impact on OHRQoL, adjusted for untreated caries. Contextual variables were not associated with TDI in 12-year-old Brazilian schoolchildren. Interdisciplinary actions for preventing dental trauma, such as stimulating the use of mouthguards, have to be encouraged by the family health strategy (FHS) and school health programme (SHP).