Possible variations in extraction indications over time and by place (e.g., culture, country)

It was not able to further break out the differences over time or across cultural contexts. For instance, two of the three research were conducted in the same year and area.

The likelihood that a permanent tooth extraction request will be made for non-dental and non-medical reasons

Requests from patients were reported in two investigations. Nondental and nonmedical causes (i.e., "patient requests") were cited as the reason for tooth extractions in 3.6% (95%CI, 2.9-4.4; n = 100) to 5.9% (95%CI, 4.9-7.1; n = 89) of the cases; however, these requests were not further explained. Patient requests were not mentioned in one study.

The percentage of permanent tooth extractions performed for non-dental and non-medical reasons that are likely to be denied

It was not possible to respond to this study question since none of the included studies provided data on dental extractions that were denied.