id	keyword
bjos-8640925	enamel
bjos-8640925	bleaching
bjos-8640925	peroxide
bjos-8640925	applications
bjos-8640925	raman
bjos-8640925	hydrogen
bjos-8640925	concentrations
bjos-8640925	surface
bjos-8640925	cm-1
bjos-8640925	effects
bjos-8640925	study