Arraj GP, et al. - In this systematic review and meta-analysis, researchers identified the different overjet sizes that present an increased risk for developing dental trauma across different ages and dentition stages. Studies have been considered for inclusion of healthy human participants of any age and in any dental dentition stage. Only high methodological quality studies with low risk of bias have been involved. Higher odds of developing trauma in all dentition stages and age groups were significantly associated with an increased overjet. The connection between increased overjet and dental trauma was confirmed in this analysis. The OR differs by age range, dentition stages, and differing overjet thresholds. The data presented in this work showed a child in the primary dentition could be considered as having an overjet at risk for trauma when it is greater than, or equal to 3 mm. The threshold is an overjet greater than, or equal to 5 mm in the early secondary dentition.