Table 2.

Details on the electronic search strategy.

Database	Search strings
MEDLINE (PubMed)	(mouthwash OR mouthrinse OR chlorhexidine OR cetylpyridinium chloride OR "povidone iodine" OR "hydrogen peroxide" OR delmopinol OR listerine OR "essential oils" OR cyclodextrin OR citrox) AND (SARS-CoV-2 OR coronavirus OR COVID-19) Filters: from 2019 to 2023 (("mouthwashes"[Pharmacological Action] OR "mouthwashes"[MeSH Terms] OR "mouthwashes"[All Fields] OR "mouthwash"[All Fields] OR "mouthwashing"[All Fields] OR "mouthwashings"[All Fields] OR ("mouthrinse"[All Fields] OR "mouthrinsed"[All Fields] OR "mouthrinses"[All Fields] OR "mouthrinsing"[All Fields] OR "mouthrinsings"[All Fields]) OR ("chlorhexidine"[MeSH Terms] OR "chlorhexidine"[All Fields] OR "chlorhexidin"[All Fields]) OR ("cetylpyridinium"[MeSH Terms] OR "cetylpyridinium"[All Fields] OR ("cetylpyridinium"[All Fields] AND "chloride"[All Fields]) OR "cetylpyridinium chloride"[All Fields]) OR "povidone iodine"[All Fields] OR "hydrogen peroxide"[All Fields] OR ("delmopinol"[Supplementary Concept] OR "delmopinol"[All Fields]) OR ("listerine"[Supplementary Concept] OR "listerine"[All Fields] OR "listerine"[All Fields] OR "sodium fluoride"[MeSH Terms] OR ("sodium"[All Fields] AND "fluoride"[All Fields]) OR "sodium fluoride"[All Fields]) OR "essential oils"[All Fields] OR ("cyclodextrine"[All Fields] OR "cyclodextrines"[All Fields] OR "cyclodextrins"[MeSH Terms] OR "cyclodextrins"[All Fields] OR "cyclodextrin"[All Fields]) OR "citrox"[All Fields]) AND ("sars cov 2"[MeSH Terms] OR "sars cov 2"[All Fields] OR "sars cov 2"[All Fields] OR ("coronavirus"[MeSH Terms] OR "coronavirus"[All Fields] OR "coronaviruses"[All Fields]) OR ("covid 19"[All Fields] OR "covid 19"[MeSH Terms] OR "covid 19 vaccines"[All Fields] OR "covid 19 vaccines"[MeSH Terms] OR "covid 19 serotherapy"[All Fields] OR "covid 19 nucleic acid testing"[All Fields] OR "covid 19 nucleic acid testing"[MeSH Terms] OR "covid 19 serological testing"[All Fields] OR "covid 19 serological testing"[MeSH Terms] OR "covid 19 testing"[All Fields] OR "covid 19 testing"[MeSH Terms] OR "sars cov 2"[All Fields] OR "sars cov 2"[MeSH Terms] OR "severe acute respiratory syndrome coronavirus 2"[All Fields] OR "ncov"[All Fields] OR "2019 ncov"[All Fields] OR (("coronavirus"[MeSH Terms] OR "coronavirus"[All Fields] OR "cov"[All Fields]) AND 2019/11/01:3000/12/31[Date - Publication])))) AND (2019:2023[pdat])
Scopus	TITLE-ABS-KEY ((mouthwash OR mouthrinse OR chlorhexidine OR "cetylpyridinium chloride" OR "povidone iodine" OR "hydrogen peroxide" OR delmopinol OR listerine OR "essential oils" OR cyclodextrin OR citrox) AND (sars-cov-2 OR coronavirus OR covid-19)) AND PUBYEAR > 2018 AND PUBYEAR > 2018
Cochrane	(mouthwash OR mouthrinse OR chlorhexidine OR cetylpyridinium chloride OR povidone iodine OR hydrogen peroxide OR delmopinol OR Listerine OR essential oils OR cyclodextrin OR citrox) AND (SARS-CoV-2 OR coronavirus OR COVID-19) in Title Abstract Keyword - with Publication Year from 2019 to 2023, with Cochrane Library publication date Between Dec 2019 and Jun 2023, in Trials