Table 2.

Eligibility criteria for the study selection

Category	Inclusion criteria	Exclusion criteria
Participants	• Human teeth • Enamel • No defects, microcracks, caries, restorations, or developmental lesions	• Animal teeth (e.g. bovine teeth) • Not enamel(e.g. root) • Enamel with defects, microcracks, or caries
Intervention	Er,Cr:YSGG laser interacts with the remineralising agents CPP-ACP(e.g. MI paste, Tooth Mousse)	Other remineralising agents(e.g. fluoride, CPP-ACFP) and other lasers
Comparison	Only CPP-ACP	Other remineralising agents
Outcome	The remineralisation efficacy: • Enamel surface microhardness • Demineralised lesion depth	The remineralisation efficacy was not evaluated
Study design	In vitro studies	• Case reports • Reviews • Abstracts • In vivo studies