Torus is a ridge of bone or muscle that are usually asymptomatic unless ulcerated but may sometimes affect speech and tongue movement, Torus palatinus and torus mandibularis are the most common tori in the oral cavity. The objective of this study was to determine the prevalence of torus palatinus and torus mandibularis among 5-15-year-old schoolchildren. A descriptive cross sectional school based study among 894 children selected by systematic random sampling from 10 basic schools in Khartoum locality. Children were examined by mouth mirror at schools in an upright chair, where presence, size, site of tori in the mandible and maxilla were recorded in check list. Comparison between variables using chi square test with the level of significance set at value <0.05. The prevalence of tori was 25% with the highest occurrence being the palatal 23.7% and mandibular 5.7%, females count was more predominant compared to males 63%, 37% respectively. There was a significance correlation between the age of the children and presence of tori, Also between the presence of mandibular and palatal tori and occurrence of bilateral tori p<0.05. The prevalence of tori was high among basic schoolchildren in Khartoum locality, females were more affected with age 12-15 being the most and the most common site was palatal