Table 2.

Search formula for each research question. An electronic search of PubMed and the Cochrane Library database was performed. Articles published between January 1, 2000 to April 11, 2022, were considered.

a: Search formula for RQ1 using PubMed.
#1	“aged”[MeSH Terms] OR “elderly”[Title/Abstract] OR “aged”[MeSH Terms] OR “older adults”[Title/Abstract]
#2	“dementia”[MeSH Terms] OR dementia[Title/Abstract]
#3	“cognition”[MeSH Terms] OR cognitive function[Title/Abstract]
#4	“cognitive dysfunction”[MeSH Terms] OR cognitive decline[Title/Abstract] OR cognitive impairment[Title/Abstract]
#5	“mastication”[MeSH Terms] OR chewing[Title/Abstract]
#6	#2 OR #3 OR #4
#7	#1 AND #5 AND #6
B: Search formula for RQ1 using Cochrane Library.
#1	MeSH descriptor: [Aged] in all MeSH products
#2	MeSH descriptor: [Cognition] explode all trees
#3	MeSH descriptor: [Cognitive Dysfunction] explode all trees
#4	MeSH descriptor: [Dementia] explode all trees
#5	MeSH descriptor: [Mastication] explode all trees
#6	#2 OR #3 OR #5
#7	#1 AND #5 AND #6
c: Search formula for RQ2 using PubMed.
#1	"aged"[MeSH Terms] OR "elderly"[Title/Abstract] OR "aged"[MeSH Terms] OR "older adults"[Title/Abstract]
#2	"young adult"[MeSH Terms] OR young adult[Title/Abstract]
#3	"cognition"[MeSH Terms] OR cognitive function[Title/Abstract]
#4	"cognitive dysfunction"[MeSH Terms] OR cognitive decline[Title/Abstract] OR cognitive impairment[Title/Abstract]
#5	"mastication"[MeSH Terms] OR chewing[Title/Abstract]
#6	#3 OR #4
#7	#1 AND #5 AND #6
#8	#2 AND #5 AND #6
d: Search formula for RQ2 using Cochrane Library.
#1	MeSH descriptor: [Aged] in all MeSH products
#2	MeSH descriptor: [Young Adult] explode all trees
#3	MeSH descriptor: [Cognition] explode all trees
#4	MeSH descriptor: [Cognitive Dysfunction] explode all trees
#5	MeSH descriptor: [Mastication] explode all trees
#6	(mastication):ti,ab,kw OR (chewing):ti,ab,kw
#7	#3 OR #4
#8	#5 OR #6
#9	#1 AND #7 AND #8
#10	#2 AND #7 AND #8

RQ: Research question.