Table 1.

The search strategy and tools for risk of bias assessment used in the study

Population	Denture wearers
Intervention	Visual assessment methods of denture plaque-deposited area
Comparison/ Control	Comparison to clean or new dentures
Outcomes	Denture plaque deposited area
Searched terms	(“Denture hygiene” OR “denture cleanliness” OR “denture plaque” OR “denture care”) AND (“assessment” OR “observation” OR “study” OR “investigation” OR “score” OR “scale” OR “index” OR “method” OR “model” OR “way”)
Database	PubMed, Medline, Embase, and Cochrane Library
Filter	No filter applied
Search date	The most recent search was performed on March 31, 2022.
Risk of Bias Assessment Tools	The National Institutes of Health (NIH) quality assessment tools for controlled intervention studies/observational cohort and cross-sectional studies/before-after (Pre-Post) study with no control group/case-control studies/case series