Abstract
The objective of the present study was to investigate the reasons of the permanent tooth extraction and its relationship with age and gender, for which 662 participants, divided into five age groups 14-23, 24-33, 34-43, 44-53, and <= 54-years-old were studied. Oral and radiographic examinations were done for each participant. Causes of tooth loss, age group, gender, Khat chewing, Shammah use, smoking, teeth brushing and Miswak using were recorded. The data were statically analyzed with SPSS program using Chi-square tests. The p value <= 0.050 were considered statistically significant. From the total number of the participants 335(50.6%) were males. The highest age group was in the 14-23 age-group (43.1%). Dental caries was represented by (49.53), while the periodontal disease was (23.3%). The failure of root canal treatment, orthodontic and other causes were (3.6%, 11.3%, 11.3%), respectively. There were significant differences between genders and different age groups in relation to causes of tooth extraction.