Table 1.

Search strategy and results for T pubmed, Embase and cochranme library

Database	Search strategy	Result
pubmed	#1: pain OR discomfort OR toothache	591803
	#2 :(low power laser) OR ( low level laser ) OR LLLT OR (low output laser) OR (low intensity laser)	10881
	#3: orthodontic*	52498
	#4 : #1 AND #2 AND #3	33
EMBASE	#1: pain OR discomfort OR toothache	1054689
	#2 : (low power laser) OR ( low level laser ) OR LLLT OR (low output laser) OR (low intensity laser)	19478
	#3: orthodontic*	61408
	#4: #1 AND #2 AND #3	49
The Cochrane library	#1: (pain OR discomfort OR toothache) AND laser AND orthodontic*	42