This review of the effect of helmet use on the incidence of maxillofacial injuries due to cycling, e-bike, scooter, and e- scooter accidents included 14 studies. The findings suggest a significant reduction in the risk of maxillofacial injury with helmet use Odds ratio = 0.682 (95%CI; 0.565 to 0.822). Although all but 2 of the studies were retrospective and only 5 studies were considered to be of high quality .