The objective of this crossectional descriptive study was to compare the oral impact on quality of life of grade 6 students between the gold and bronze health promoting schools in Muangsamsib district, Ubonratchatani. 174 students from gold-level and 206 students from bronze-level health promoting school were interviewed using a questionnaire measuring an oral impact on quality of life by The CHILD–OIDP index. The result showed that 56.3% of students in the gold-level and 60.7% of students in the bronze-level health promoting schools had one or more oral impact. Eating was the most common performance affected of both groups. Similarly, the major clinical cause of oral impact was toothache. The prevalence of oral impacts between the two groups of students was not statistically different. The present finding supports the view that the gold level schools’ health promotion activities do not reflect the better oral health related quality of life comparing to the bronze-level schools. Therefore, dental health indicator should be compulsing for the evaluation of the gold-level schools.