Database	Search Strategy	Filters/Limitations
PubMed	(“amyotrophic lateral sclerosis” [MeSH Terms] OR (“amyotrophic” [All Fields] AND “lateral” [All Fields] AND “sclerosis” [All Fields]) OR “amyotrophic lateral sclerosis” [All Fields]) AND ((“oral health” [MeSH Terms] OR (“oral” [All Fields] AND “health” [All Fields]) OR “oral health” [All Fields]) AND “status” [All Fields]) AND ((casereports [Filter] OR clinicalstudy [Filter] OR clinicaltrial [Filter] OR controlledclinicaltrial [Filter] OR randomizedcontrolledtrial [Filter]) AND (humans [Filter]) AND (English [Filter]))	Humans, English, case reports, clinical study, clinical trial, controlled clinical trial, randomized controlled trial
Scopus	(TITLE-ABS-KEY (“amyotrophic lateral sclerosis”) OR TITLE-ABS-KEY (ALS)) AND (TITLE-ABS-KEY (“oral health status”) OR (TITLE-ABS-KEY (“oral health”) AND TITLE-ABS-KEY (status)))	Document type: article; language: English
Embase	(‘amyotrophic lateral sclerosis’/exp OR ‘amyotrophic lateral sclerosis’) AND (‘oral health status’ OR (‘oral health’/exp AND status)) AND ([english]/lim AND [humans]/lim) AND ([article]/lim OR [clinical study]/lim OR [clinical trial]/lim OR [randomized controlled trial]/lim OR [case report]/lim)	Humans, English, case report, clinical study, clinical trial, randomized controlled trial
Web of Science	TS = (“amyotrophic lateral sclerosis” OR ALS) AND TS = (“oral health status” OR (“oral health” AND status))	Language: English; document type: article