“…The prevalence of caries was expressed in the six types of disadvantaged subjects, starting in the description with those most affected, such as prisoners with 77% ([95% CI 66–85%]; 803 participants, three studies, I 2 = 90%) [ 22 , 23 , 24 ], elderly people with 62% ([95% CI 50–73%]; 38,133 participants, 24 studies, I 2 = 99.7%) [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ] ( Figure 2 ), alcohol and drug abusers with 60% ([95% CI 56–64]; 592 participants, two studies, I 2 = not assessable) [ 49 , 50 ], immigrants with 65% ([95% CI 18–99%]; 878 participants, three studies, I 2 = 99.1%) [ 39 , 51 , 52 ], followed by pregnant women with 29% ([95% CI 8–56%]; 506 participants, three studies, I 2 = 97.4%) [ 53 , 54 , 55 ]. All groups showed high scores of prevalence.…”