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Objective: To evaluate the possible antagonistic effects of four probiotics Lactobacillus acidophilus(La)、Bifidobacterium adolescents(Ba)、Streptococcus salivarius(Ss)、Lactobacillus delbrueckii subsp.bulgaricus(Lb)on halitosis pathogens,Porphyromonas gingivalis(Pg)and Fusobacteriurn nuclearum(Fn).