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Short-term effect of a new mouthrinse formulation on oral malodour after single use in vivo: a comparative, randomized, single-blind, parallel-group clinical study

This study aimed to compare a new chlorhexidine (CHX)-free mouthrinse containing amine fluoride/stannous fluoride (ASF) against a benchmark containing CHX with respect to their effect on oral malodour after single use. A total of 42 male and female subjects with an intraoral cause of bad breath, each with an organoleptic rating (OR) of at least 2 and a total volatile sulfur compound (VSC) concentration higher than 130 ppb, participated in the study. Subjects were allocated to one of three treatment groups (i.e. CHX-free ASF mouthrinse, CHX benchmark mouthrinse or water) according to a randomization list. Participants received written instructions on precautions to be taken for optimal breath analysis. Eight trained and qualified odour judges assessed the subjects' malodour by OR at baseline and 30 min and 4 h after single use of the mouthrinses. Additionally, VSC levels were measured at baseline and 4 h after using the mouthrinse. Treatment with water alone led already to some reduction in OR with mean differences to baseline of −1.13 at 30 min and −0.64, 4 h after treatment. Both CHX-free ASF product (−1.51) and CHX (−1.48) provided a significantly stronger OR reduction than water at 30 min (p < 0.05). Only CHX-free ASF treatment showed a sustained benefit in terms of significantly better OR reduction after 4 h (−1.17, p < 0.05), whereas CHX (−0.81) was not significantly different from water (−0.64, p = 0.517). Both ASF (−90.9%) and CHX (−81.6%) reduced VSC levels significantly stronger than water (−53.5%; p < 0.001). OR and VSC readings in the group using the CHX mouthrinse did not differ significantly from those in the group using the CHX-free ASF formulation. The newly developed CHX-free ASF mouthrinse significantly reduced oral malodour after single use, both in terms of OR and VSC levels. Efficacy was comparable to that of the CHX benchmark product.