Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Breath odour
RCT	31 women	Change in odour unpleasantness from baseline 8 hours from –1.25 to –0.63 with single-use chlorine dioxide mouthwash from –1.40 to –1.29 with distilled water	P <0.01	Effect size not calculated	single-use chlorine dioxide mouthwash
RCT	31 women	Change in odour unpleasantness from baseline 24 hours with single-use chlorine dioxide mouthwash with distilled water Absolute results not reported	Reported as non-significant P value >0.05		Not significant
RCT	31 women	Change in odour unpleasantness from baseline 48 hours with single-use chlorine dioxide mouthwash with distilled water Absolute results not reported	Reported as non-significant P value >0.05		Not significant
RCT	31 women	Change in odour unpleasantness from baseline 72 hours with single-use chlorine dioxide mouthwash with distilled water Absolute results not reported	Reported as non-significant P value >0.05		Not significant
RCT	31 women	Change in odour unpleasantness from baseline 96 hours with single-use chlorine dioxide mouthwash with distilled water Absolute results not reported	Reported as non-significant P value > 0.05		Not significant
RCT	31 women	Change in odour intensity from baseline 8 hours from 1.27 to 0.63 with single-use chlorine dioxide mouthwash from 1.42 to 1.29 with distilled water	P <0.01	Effect size not calculated	single-use chlorine dioxide mouthwash
RCT	31 women	Change in odour intensity from baseline 24 hours with single-use chlorine dioxide mouthwash with distilled water Absolute results not reported	Reported as non-significant P >0.05		Not significant
RCT	31 women	Change in odour intensity from baseline 48 hours with single-use chlorine dioxide mouthwash with distilled water Absolute results not reported	Reported as non-significant P value >0.05		Not significant
RCT	31 women	Change in odour intensity from baseline 72 hours with single-use chlorine dioxide mouthwash with distilled water Absolute results not reported	Reported as non-significant P value >0.05		Not significant
RCT	31 women	Change in odour intensity from baseline 96 hours with single-use chlorine dioxide mouthwash with distilled water Absolute results not reported	Reported as non-significant P >0.05		Not significant
RCT Crossover design	12 people	Change in odour unpleasantness score from baseline 4 hours from –1.25 to –0.61 with single-use chlorine dioxide mouthwash from –1.06 to –1.08 with distilled water	P <0.01	Effect size not calculated	single-use chlorine dioxide mouthwash
RCT Crossover design	12 people	Change in odour intensity score from baseline 4 hours from 1.14 to 0.81 with single-use chlorine dioxide mouthwash from 1.11 to 1.19 with distilled water	P = 0.03	Effect size not calculated	single-use chlorine dioxide mouthwash
RCT 4-armed trial	99 people	Mean odour score change from baseline 4 hours –0.94 with single-use mouthwash containing cetylpyridinium chloride –0.22 with placebo mouthwash	P <0.05 for single-use cetylpyridinium chloride mouthwash v placebo	Effect size not calculated	single-use cetylpyridinium chloride mouthwash
RCT 4-armed trial	99 people	Mean odour score change from baseline 4 hours –0.52 with single-use mouthwash containing chlorine dioxide –0.22 with placebo mouthwash	P value reported as not significant for single-use mouthwash containing chlorine dioxide v placebo		Not significant
RCT 4-armed trial	99 people	Mean odour score change from baseline 4 hours –0.42 with essential oil mouthwash –0.22 with placebo mouthwash	P value reported as not significant for single-use mouthwash containing essential oil v placebo		Not significant