“…In most of the studies [4,17,[28][29][30]37,38,[40][41][42], the participants were patients at a university periodontal clinic or private dental practice. Five studies [31,33,35,36,41] were epidemiological surveys involving the residents in a particular area or a randomly selected general population. The study by Lopez et al [39] was the only study that included students attending high school, which emphasized the relevance of assessing psychosocial stress and its association with periodontitis early in life.…”