A few studies have revealed that probiotic Lactobacillus strains were useful in reducing gingival inflammation and the number of black-pigmented rods, including Porphyromonas gingivalis (Pg), in the saliva and sub-gingival plaque. Concerning periodontal conditions, its shown that application of beneficial bacteria, as an adjunct to scaling and root planing (SRP), can inhibit re-colonization of pathogens in periodontal pockets and reduce bleeding on probing.