Objective: The objective of the study was to determine the range of nasiolabial and mentolabial angles in normal Pakistani adult and to establish any sexual dimorphism if present.

Method: Five hundred objects 500 were selected from the indoor of the de’Mont morency College of dentistry, Lahore. Written consent was obtained from all the participants and were guaranteed that secrecy of all the data was kept up. They were selected using following criteria 1)subjects aged between 18-30 years both males and females 2)skeletal class 1,2 and 3 using ANB of Stenier’s analysis with no or minor crowding, good facial asymmetry and full dentition irrespective of third molar. Gender wise difference was found using independent sample t test.

Results: The results of Independent sample t test revealed that there was a significant gender wise difference with regards to nasiolabial (t= 3.827, P<.001) and mentolabial angle (t= -2.733, P<.007).

Conclusion: The results showed wider nasiolabial angle in males while no significant difference in terms of skeletal classes. However, mentolabial angle was less in males than females and highest in class 3 than class 1 which was greater than class 2.The impact of sex was significant in both angles

Keywords: Nasiolabial angel, Mentolabial angle, Sexual Dimorphism, Angular photogrammetric analysis