id	keyword
bjos-8659280	toothbrushes
bjos-8659280	brushing
bjos-8659280	months
bjos-8659280	study
bjos-8659280	manual
bjos-8659280	doi
bjos-8659280	wear
bjos-8659280	gingival
bjos-8659280	biofilm
bjos-8659280	plaque
bjos-8659280	analysis
bjos-8659280	group
bjos-8659280	removal
bjos-8659280	ultrasonic
bjos-8659280	baseline
bjos-8659280	index