Table 1.

The search strategy of the scoping review

Databases	Key words combination
PubMed	((("Dental Health Surveys"[Mesh]) OR ( "Oral Health"[Mesh] OR "Dental Health Services"[Mesh] )) AND ((((("Socioeconomic Factors"[Mesh]) OR "Hierarchy, Social"[Mesh]) OR ( "Healthcare Disparities"[Mesh] OR "Health Status Disparities"[Mesh] )) OR "Social Determinants of Health"[Mesh]) OR "Social Class"[Mesh])) AND (((("dental services"[Title/Abstract]) OR ("dental visits"[Title/Abstract])) OR (utilization[Title/Abstract])) OR ("use of services"[Title/Abstract]))
SCOPUS	TITLE-ABS-KEY("oral health") OR TITLE-ABS-KEY("Dental Health Surveys") OR TITLE-ABS-KEY("Dental Health") OR TITLE-ABS-KEY("dental care") AND TITLE-ABS-KEY("Socioeconomic Factors") OR TITLE-ABS-KEY("Social Hierarchy") OR TITLE-ABS-KEY(Inequalities) OR TITLE-ABS-KEY("Social Disparities") OR TITLE-ABS-KEY("Social Gradient") OR TITLE-ABS-KEY("Health Status") OR TITLE-ABS-KEY("socioeconomic disadvantage") OR TITLE-ABS-KEY("socioeconomic inequalities") OR TITLE-ABS-KEY("Social Determinants") AND TITLE-ABS-KEY("dental services") OR TITLE-ABS-KEY("dental visits") OR TITLE-ABS-KEY("utilization") OR TITLE-ABS-KEY(access) OR TITLE-ABS-KEY("use of services")
WOS	TOPIC: (“Dental Health Surveys” OR “Oral Health Disparities” OR “Dental Health” OR “Oral Health” OR "dental care") (“Socioeconomic Factors” OR “Social Hierarchy” OR “Inequalities” OR “Social Disparities” OR “Social Gradient*” OR “Health Status*” OR “socioeconomic disadvantage” OR “socioeconomic inequalities” OR “Social Determinants” OR “Socio Economic Status”) TOPIC: (“dental services)
ProQuest	(MESH.EXACT("Dental Care") OR MJMESH.EXACT("Dental Health Surveys") OR MJMESH.EXACT("Dental Health Services") OR MJMESH.EXACT("Oral Health")) AND (MJMESH.EXACT("Socioeconomic Factors") OR MESH.EXACT("Social Class") OR MJMESH.EXACT("Social Determinants of Health"))