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Background and Objectives: to many dental disciplines, especially oral and maxillofacial surgeons to perform dental treatments and oral surgical procedures comfortably. This study was conducted to estimate the degree of mouth opening and its correlation to sex, age, height and weight.Methods: The maximum mean mouth opening of 1262 Kurdish adult was measured using a calibrated ruler, in addition to body height and weight. Student-t test was used to assess the statistical difference between males and females and Pearson correlation coefficient to assess the correlation between mouth opening and both body height and weight.Results: The mean value of mouth opening was 50.56 mm for males and 48.46 mm for females. The greatest mean mouth opening was noted in the age group of 16-24 and decreased gradually with advanced age. A significant positive correlation was noted between mouth opening and both body height and weight.Conclusions: Mouth opening was higher in males than females in all age groups and decreased gradually with advancing age. It was positively correlated with body height and weight.

Mouth opening --- Body height --- Body weight