Prevalence and public knowledge regarding tooth bleaching in Saudi Arabia.

Background: Nowadays, cosmetic dentistry has become one of the most important sections of dentistry because patients care about the appearance of their smile with their general health. Hence, the present study was conducted to find the prevalence of public knowledge regarding tooth bleaching in Saudi Arabia.

Methods: A cross sectional study with cluster sampling method was carried out in the central, northern, southern, eastern, and western regions of the Kingdom of Saudi Arabia.

Prevalence of irritable bowel syndrome among Qassim school teachers, and its impact on their performance and life duties.

Objectives: To determine the prevalence of irritable bowel syndrome (IBS) among school teachers in Qassim region,  Kingdom of Saudi Arabia (KSA) and it's impact on their performance -as teachers- and on life duties.  

Methods: A cross-sectional study was held in Qassim region, KSA between 2012 and 2013. The study was conducted among 300 school teachers selected by multistage stratified random sample method in 2013.