“…37,41,48,88,90, 92-94,100(a),100(b),100(c) Fifteen studies relied on the reports of individuals' dental check frequency behaviour from self-administered questionnaires or interviews. 25,31,49,57,58,[60][61][62]64,65,71,83,85,91,97 In three it was not clear how dental check frequency was ascertained. 98(a),98(b), 98(c) Information about payment systems to dental practitioners was poorly reported.…”