Overall in our sample of children whose parents completed the survey,there were almost 169 days lost by students (77 students · 2.19 days) because of dental problems and 218 days lost (86 parents · 2.53 days) by parents because of their children’s dental problems. Given the size of the LAUSD (136873 students), these numbers translate to 16431 school days annually. This is equivalent to 58 school hours missed each year per 100 elementary school-aged children and 80 school hours missed each year per 100 high school-aged children (based on the number of instructional minutes in LAUSD schools). Our estimate is lower than the estimate by Gift et al. of 117 school hours missed each year per 100 school-aged children.4