id	keyword
bjos-8671938	surface
bjos-8671938	bleaching
bjos-8671938	roughness
bjos-8671938	composite
bjos-8671938	resin
bjos-8671938	surface roughness
bjos-8671938	dent
bjos-8671938	doi
bjos-8671938	toothpaste
bjos-8671938	brushing
bjos-8671938	oral
bjos-8671938	whitening