INTRODUCTION: The study was conducted to assess the impact of oral health status on the oral health related quality of life OHRQOL of children between 12 and 15 years with type 1 diabetes mellitus IDDM in Saudi Arabia and compare these findings to age and gender matched medically fit children. ...The oral health of all children was recorded using WHO examination criteria. Parental perception of the OHRQoL was recorded using the validated Arabic version of the short form child oral health impact profile short form COHIP 19. ...