id	keyword
mkg-855	periodontal
mkg-855	vscs
mkg-855	h2s
mkg-855	oral
mkg-855	apoptosis
mkg-855	disease
mkg-855	cells
mkg-855	periodontitis
mkg-855	compounds
mkg-855	gingival
mkg-855	sulfide
mkg-855	halitosis
mkg-855	hydrogen
mkg-855	malodor