Current evidence is supportive of recommending probiotics for the management of halitosis .
Based on this review , transient ( average of 2 weeks ) dosing with probiotics ( mainly Lactobacillus strains ) has a moderate effect on halitosis regarding OLT scores , but we could not confirm the effects of probiotics on the VSC reduction .
Although several studies have evaluated the inhibitory effect of  probiotics  on  halitosis  , findings are inconsistent .
This systematic review and meta- analysis of r and omized clinical trials ( RCT ) was conducted to summarize the evidence on the effect of  probiotics on halitosis .
Effect of chewing gums containing the probiotic bacterium Lactobacillus reuteri on oral malodour
Abstract Objective . To evaluate the effect of chewing gums containing probiotic bacteria on  oral malodour .  The null hypothesis was that no difference would be displayed compared with placebo gums . Material s and methods . Twenty-five healthy young adults with self-reported malodorous morning breath completed this r and omized double-blind placebo-controlled cross-over trial . The design included run-in and wash-out periods interspersed by two intervention periods of 14 days each . The subjects were instructed to chew one gum in the morning and one in the evening containing either two strains of probiotic lactobacilli ( L. reuteri DSM 17938 and L. reuteri ATCC PTA 5289 ) or placebo . The outcome measures were ( i ) organoleptic scores ( 0–5 ) by a certified test panel , ( ii ) concentration of volatile sulphur compounds ( VSC ) measured with a Halimeter and ( iii ) concentration of VSC after a cysteine rinse . Registration s were made at baseline and after each intervention period . Differences between the groups were assessed by non-parametric paired statistics and chi-square test . Results . The median organoleptic score was similar ( score 2 ) in both groups at baseline . After 14 days of treatment , the organoleptic scores were significantly lower in the probiotic group compared with the placebo group ( p < 0.05 ) . Assessment s of the VSC levels displayed no significant differences between the groups , either before or after rinsing with L-cysteine . No adverse effects were registered . Conclusion . The results demonstrated that probiotic chewing gums may have some beneficial effect on oral malodour assessed by organoleptic scores . The results indicate that the probiotic gum may affect bacteria that produce malodourous compounds other than VSCs
Current evidence is supportive of recommending probiotics for the management of halitosis .
Based on this review , transient ( average of 2 weeks ) dosing with probiotics ( mainly Lactobacillus strains ) has a moderate effect on halitosis regarding OLT scores , but we could not confirm the effects of probiotics on the VSC reduction .
Although several studies have evaluated the inhibitory effect of  probiotics  on  halitosis  , findings are inconsistent .
This systematic review and meta- analysis of r and omized clinical trials ( RCT ) was conducted to summarize the evidence on the effect of  probiotics on halitosis .