Inclusion Criteria  Participants must be adult males or females between the ages of 18 and 65 years (inclusive) reporting halitosis Participants must be able and willing to follow study procedures and instructions Participants must have read, understood and signed an informed consent form Participants must present with at least 8 teeth in the functional dentition and with at least 4 teeth in each posterior sextant, 3 of which are adjacent teeth with interproximal papilla in each posterior sextant that will have the stent Participants must be in good general health  Exclusion Criteria  Patients ongoing restorative or periodontal dental treatment or any other medical treatment Subjects with any pathological alterations of the oral mucosa Any known allergy to previously used oral hygiene products or any known allergy to any of the ingredients of the study products, which are used during the study Pregnant women Subjects with untreated periodontitis or active caries lesion Subjects diagnosed with acute sinusitis, bronchitis or tonsillitis Subjects under treatment on medications which can cause malodor, e.g. amphetamines, nitrates and nitrites Known diabetes, liver or kidney insufficiency Subjects diagnosed with reduced salivary flow due to pathological reasons (e.g. Sjögren syndrome) Subjects who underwent preventive periodontal treatment, i.e. oral prophylaxis treatment, within the last week Volunteers unwilling to abstain from additional oral hygiene (only tooth brushing allowed) particularly mouthrinse, chewing gums, breath strips, etc and alcohol 12 h prior the first measurement at the study site and until the completion of all measurements