“…This outcome was described in three types of vulnerable individuals. In the elderly, one third of the subjects examined showed a reduced quality of life due to oral health problems such as pain, difficulty chewing or swallowing and psychological and/or relational discomfort due to the condition of their teeth (28% [95% CI 19–38]; 16,672 participants, 11 studies, I 2 = 99.3%) [ 45 , 111 , 116 , 125 , 132 , 140 , 184 , 185 , 186 , 187 , 188 ], while the prevalence of this outcome in immigrants was 55% ([95% CI 21–87%]; 709 participants, three studies, I 2 = 99.3%) [ 52 , 189 , 190 ]. Finally, in the only comparative study carried out, subjects living in rural areas compared to those in urban areas presented a worse quality of life related to dental or periodontal disorders measured with a specific scale called the Oral Health Impact Profile—14-item questionnaire (11.49 SD 9.733 vs. 5.88 SD 5.588, p < 0.001; 100 participants) [ 191 ].…”