It is important to understand how people perceive the impact of oral diseases on quality of life. Oral health related quality of life (OHRQoL) is a relatively new but rapidly growing notion. The concept of OHRQOL is particularly significant to 3 areas - clinical practice of dentistry, dental research and dental education. There are different approaches to measure OHRQOL, the most popular one uses multi item questionnaires.This text book gives insight into methodology for conducting research on oral health related quality of life using OHQOL-U.K instrument.