Table 1a.

The keywords and search strategy through the databases

Keywords	PubMed	Scopus	EBSCOhost	Embase	Science direct
Probiotics, probiotic, dental caries, oral cavity, probiotic streptococci Search string ((((probitoics) OR probiotic)) AND (((dental caries) OR oral cavity) OR oral))	2630	1457	1325	1232	1863