“…Caries experience (DMFT) was calculated in six types of disadvantaged individuals, of which the elderly were those with the highest DMFT 18.7 SD 2.4 ([95% CI 13.5–24]; 1160 participants, 17 studies) [ 25 , 28 , 30 , 31 , 34 , 40 , 41 , 44 , 48 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ], followed by homeless subjects with DMFT 17.3 SD 0.4 ([95% CI 12.6–22.1]; 100 participants, two studies) [ 67 , 68 ], immigrants with 14.9 SD 0.9 ([95% CI 9.6–18.7]; 843 participants, two studies) [ 51 , 52 ], alcohol and drug abusers with 12.9 SD 0.8 ([95% CI 11.2–14.6]; 1891 participants, nine studies) [ 49 , 50 , 69 , 70 , 71 , 72 , 73 , 74 , 75 ], low-income people with9.9 SD 0.5 ([95% CI 3–16.7];3043 participants, two studies) [ 60 , 76 ], low-education people with 9.8 SD0.03 ([95% CI 9.4–10.2]; 3043 participants, two studies) [ 60 , 76 ] and prisoners with 8.9 SD 0.8 ([95% CI 6.3–10.4]; 802 participants, three studies) [ 22 , 23 , 24 ]. Lower DMFT was found in sex workers with 2.3 (249 participants) [ 77 ] and in subjects who work without any specific qualification with 2.9 (510 participants) [ 78 ].…”