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Efficacy of chlorine dioxide mouthwash against halitosis
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2017 J. Phys.: Conf. Ser. 884 012136
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The 1st Physics and Technologies in Medicine and Dentistry Symposium IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 884 (2017) 012136 doi :10.1088/1742-6596/884/1/012136
Efficacy of chlorine dioxide mouthwash against halitosis
M D Bestari, H Sunarto and Y Kemal*
Department of Periodontics, Faculty of Dentistry, Universitas Indonesia, Jakarta, Indonesia
*E-mail: yulianti.kemal@ui.ac.id
Abstract. To ascertain the effectiveness of using chlorine dioxide mouthwash in addressing
halitosis. Forty people were divided equally into the test group (required to gargle with
mouthwash containing chlorine dioxide) and the control group (required to gargle with
aquadest). The volatile sulfur compound (VSC) and organoleptic scores were measured before
gargling and 30 min, 2 h, 4 h, and 6 h after. The Wilcoxon test analysis showed a significant
difference (p<0.05) in the mean value of VSC scores between the test group and the control
group in four testing periods after gargling. Chlorine dioxide mouthwash is effective in
addressing halitosis.
1. Introduction
Oral health is essential and has an important role in everyday life. In Indonesia, oral health remains
one of the main problems suffered by the community. The Indonesian Household Health Survey in
2001 showed that oral health problems are the complaints of 60% of the Indonesian population. Dental
and oral diseases, which are usually found among the people of Indonesia, include dental caries,
periodontitis, gingivitis, stomatitis apthosa, and halitosis [1]. Halitosis or bad breath is defined as an
unpleasant breath arising from physiological and pathological factors derived from oral or systemic
sources and is one of the most frequent oral health problems. Several studies conducted in
industrialized countries showed a prevalence of halitosis of as high as 50% with various severities [2].
Besides health problems, halitosis can also greatly affect the social life of patients.
About 80%–90% of halitosis comes from the oral cavity, and the accumulation of bacteria on the
posterior part of the tongue is one of its main causes [3]. Halitosis can be caused by various factors,
such as foods and drinks, poor oral hygiene, periodontal diseases, tongue coating, xerostomia (dry
mouth), and systemic diseases [2]. Moreover, halitosis can be caused by upper and lower respiratory
tract disorders, digestive disorders, and use of certain drugs [4]. Volatile sulfur compound (VSC) is the
major cause of halitosis. The VSC components, are hydrogen sulfide gas (H2S), methyl mercaptan
(CH3SH), and dimethyl sulfide ((CH3)2S). VSC is formed through the reactions of non-volatile
materials in the mouth, especially protein, with anaerobic bacteria in the oral cavity [2].
Prevention efforts and treatment of halitosis are brushing the teeth and the tongue, using
mouthwash, and improving one’s diet. Treatments such as brushing the teeth and tongue or using an
antiseptic mouthwash have been proved to reduce hydrogen sulfide and methyl mercaptan, which are
the components of VSC [5].
The use of mouthwash is a simple effort to overcome halitosis. Particularly in Indonesia, the
market offers a wide variety of brands with different active ingredients of mouthwashes.
Chlorhexidine is the most commonly used antibacterial agent. However, although chlorhexidine is one
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The 1st Physics and Technologies in Medicine and Dentistry Symposium IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 884 (2017) 012136 doi :10.1088/1742-6596/884/1/012136
of the most effective oral antiseptic agents, research shows that the long-term use of chlorhexidine has
some side effects, such as staining on the teeth and tongue and reduced sensitivity of taste buds [6,7].
Developments in dentistry have produced several discoveries of new products that can be used as
supporting periodontal treatment, one of which is chlorine dioxide (ClO2). ClO2 is a strong oxidizing
agent that can kill bacteria through a protein synthesis mechanism [8]. It contains oxygen, which can
be used as an antiseptic on wounds and accelerates healing, and is effective for halitosis, gingivitis,
periodontitis, and bleeding gums [10-12]. ClO2 and chlorite anion (ClO2-) together can oxidize VSC to
become a non-malodor product and destroy amino acids, such as cysteine and methionine, which are
VSC precursors, in the process of oxidation [12]. Mouthwashes containing ClO2 have been widely
used in developed countries, such as Japan and the United States, and ClO2 mouthwash has been
reported to be effective in reducing bad breath in the morning (morning breath malodor) up to 4 h after
application in healthy subjects [13]. In Indonesia, mouthwashes containing ClO2 are not too popular
among the public. Moreover, studies on the efficacy of the use of mouthwash containing ClO2 against
halitosis in Indonesia have not yet been conducted. Therefore, this research is conducted to analyze the
efficacy of using mouthwash containing ClO2 as the active ingredient to address halitosis. The results
are expected to improve the knowledge of dentists in dealing with halitosis and to help people to
choose the right mouthwash to overcome halitosis.
2. Materials and Methods
This study used a blind randomized clinical trial by taking samples randomly before and after the
study. Data retrieval was conducted before and after a subject gargled with mouthwash provided by
the researcher. The entire protocol of this study was reviewed and approved by the Research Ethics
Committee of the Faculty of Dentistry, University of Indonesia. The sample comprised 40 people who
were chosen randomly, met all the criteria for inclusion, and were exempted from the exclusion
criteria. The 40 subjects were divided evenly into two groups: the test group, which was required to
rinse with mouthwash containing ClO2 (i.e., Oxyfresh® “Oxygene® Mouthrinse”), and the control
group, which was required to rinse with aquadest.
One day prior to the measurement, the subjects were instructed not to consume pungent foods to
prevent overload levels of VSC. All subjects were also instructed not to eat, drink, gargle, brush their
teeth, and consume chewing gum for at least 2 h prior to the initial measurements to obtain an initial
score that was not too diverse among subjects. To eliminate the psychological factors that could
become confounding factors in the study, the subjects were not told to which group they would be
included prior to the measurement. The Oxyfresh® “Oxygene® Mouthrinse” used in this study was
non-colored and clear, similar to aquadest, so that the subjects would be unaware of the type of
mouthwash they would use.
The VSC scores were measured by OralChroma™, and organoleptic measurement was performed
at 0 min before the subjects gargled (baseline), 30 min after the subjects gargled, 2 h after the subject
gargled, 4 h after the subject gargled, and 6 h after the subject gargled.The VSC scores were analyzed
by the Wilcoxon statistical test. A significance level of 0.05 (p = 0.05) and confidence level of 95% (α
= 0.05) were obtained.
3. Results and Discussion
3.1 Results
The comparison of the measurement results of the VSC scores between the test group and the control
group in each measurement period is presented in Figure 1. The comparison of the measurement
results of each score of the VSC components, the H2S scores, the CH3SH scores, and the (CH3)2S
scores is illustrated in Figures 2, 3, and 4, respectively. The results of the organoleptic measurements
in each group are shown in Figures 5 and 6.
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The 1st Physics and Technologies in Medicine and Dentistry Symposium IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 884 (2017) 012136 doi :10.1088/1742-6596/884/1/012136
Figure 1. Comparison chart of the mean value of the VSC scores between the test group and the
control group
Figure 2. Comparison chart of the mean value of the H2S scores between the test group and the
control group
0.383
0.002
0.08
0.174
0.243
0.342
0.075
0.258
0.478
0.655
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Baseline
30 minutes
2 hours
4 hours
6 hours
Measurement time
H2S Scores (ng/10ml)
The test group
The control group
VSC Scores (ng/10ml)
1.041
0.007
0.168
0.465
0.737
0.857
0.216
0.718
1.178
1.636
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
Baseline
30 minutes
2 hours
4 hours
6 hours
Measurement time
The test group
The control group
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The 1st Physics and Technologies in Medicine and Dentistry Symposium IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 884 (2017) 012136 doi :10.1088/1742-6596/884/1/012136
Figure 3. Comparison chart of the mean value of the CH3SH scores between the test group and the
control group
Figure 4. Comparison chart of the mean value of the (CH3)2S scores between the test group and the
control group
0.232
0
0.038
0.131
0.198
0.194
0.049
0.182
0.315
0.431
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Baseline
30 minutes
2 hours
4 hours
6 hours
Measurement time
The test group
The control group
0.426
0.005
0.051
0.161
0.297
0.322
0.093
0.278
0.384
0.551
0
0.1
0.2
0.3
0.4
0.5
0.6
Baseline
30 minutes
2 hours
4 hours
6 hours
Measurement time
The test group
The control group
CH3SH Scores(ng/10ml)
(CH3)2S Scores
(ng/10ml)
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The 1st Physics and Technologies in Medicine and Dentistry Symposium IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 884 (2017) 012136 doi :10.1088/1742-6596/884/1/012136
Figure 5. Diagram of the organoleptic scores in the test group
Figure 6. Diagram of the organoleptic scores in the control group
The p-value in the Wilcoxon test analysis showed no significant difference in the baseline
measurement before gargling in the VSC, H2S, CH3SH, and (CH3)2S scores between the test group and
the control group (p> 0.05). In the measurement 30 min, 2 h, 4 h, and 6 h after gargling, the p value of
the Wilcoxon test showed a significant difference in the VSC scores between the test group and the
control group (p <0.05).
3.2 Discussion
Measuring VSC with Oral Chroma has been widely used. The advantage of Oral Chroma are its
compactness, and is able to measure individual VSC (H2S, CH3SH, and (CH3)2S) [9]. The results of
9
2
4
11
8
2
16
10
17
14
1
6
0
2
4
6
8
10
12
14
16
18
Baseline
30minutes
2hours
4hours
6hours
Measurement time
Number (N)
Score 0
Score 1
Score 2
Score 3
20
13
1
3
7
19
11
17
9
0
5
10
15
20
25
Baseline
30 minutes
2 hours
4 hours
6 hours
Measurement time
Number (N)
Score 0
Score 1
Score 2
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The 1st Physics and Technologies in Medicine and Dentistry Symposium IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 884 (2017) 012136 doi :10.1088/1742-6596/884/1/012136
the VSC measurement by Oral Chroma after analyzing the Wilcoxon statistical test showed a
significant difference in the VSC scores between the control group and the test group 30 min, 2 h, 4 h,
and 6 h after treatment. In the initial measurement prior to the treatment or the baseline measurement,
no significant difference was observed between the control group and the test group. The mean value
of the VSC scores in the test group 30 min after gargling was only 0.007 ng/10 ml and that in the
control group was 0.09 ng/10 ml. At 2 h after gargling, the mean value of the VSC scores was 0.168
ng/10 ml in the test group and 0.718 ng/10 ml in the control group. At 4 h after gargling, the difference
in the mean value of the VSC scores was significant at 0.465 ng/10 ml in the test group and 1.178
ng/10 ml in the control group. At 6 h after gargling, the mean value of the VSC scores was 0.737
ng/10 ml in the test group and 1.636 ng/10 ml in the control group; the mean value of the control
group was two times greater than that of the test group. The scores of each component of VSC,
namely, the H2S, CH3SH, and (CH3)2S scores, also showed a statistically significant difference
between the test group and the control group at 30 min, 2 h, 4 h, and 6 h after treatment. The baseline
measurement of the H2S, CH3SH, and (CH3)2S scores showed no significant difference between the
test group and the control group.
VSC compounds are produced by gram-negative anaerobic bacteria that exist in the oral cavity
[14]. Silwood et al. [17] and Al-Bayaty et al. [11] found that ClO2 interacts with bacteria-specific
biomolecules and disrupts the physiological functions of microorganisms through the reactions
between the organic substances of bacterial cell wall with ClO2, which damages the cell membranes of
bacteria that produce VSC. The function of the bacterial cell membrane is to maintain the integrity of
the overall contents of the cytoplasm and selectively controls the transport of nutrients to cells;
therefore, damage to a cell membrane of bacteria can cause bacterial death [11,16]. Silwood also
observed that ClO2 could penetrate into the bacterial cell wall and react with vital amino acids in the
bacterial cytoplasm, thus killing the bacteria [17].
The results of the study by Taiyeb-ali et al. [20] strengthened those of the study by Chapek [18],
who found that the oxygen produced by ClO2 could maintain the amount of oxygen in the saliva and
gingival sulcus [18]. Anaerobic bacteria cannot survive with the presence of oxygen in the saliva and
gingival sulcus [19-20]. This condition delays the formation of VSC in the oral cavity. In addition, the
oxygen contained in ClO2 is one of the sources of antioxidants that can be used in the treatment of
periodontal diseases, as oxygen can increase the metabolic process and thus enhance immunity by
reducing the free radicals that cause inflammation [21-22].
Similar to the measurement of VSC compound with oral chromatography, the results of the
organoleptic measurement at 30 min, 2 h, 4 h, and 6 h after the treatment also showed a significant
difference between the control group and the test group. Based on the results of the VSC scores
measured by Oral Chroma and the organoleptic scores measured by the sense of smell, the increase in
VSC scores was directly proportional to the increase in organoleptic scores. Therefore, the higher the
level of VSC in the oral cavity is, the more pungent the smell of the oral cavity is perceived.
Previous study found that ClO2 mouthwash was effective in inhibiting the formation of plaque.
Moreover, research on the antibacterial effect of ClO2 indicated that ClO2 gel had a stronger
antibacterial effect against dental biofilm than hyaluronic gel and chlorhexidine, thus making it an
alternative therapy in dentistry [11,19]. The results of this study proved that ClO2 is an oxidizing agent
with a strong antibacterial effect, thus making it effective in reducing the number of VSC and as a
masking agent against halitosis. Mouthwashes containing ClO2 can be used in dentistry as an
antibacterial to effectively reduce halitosis
4. Conclusion
Gargling with mouthwash containing ClO2 is effective against halitosis in the capacity of lowering the
levels of the VSC components, namely, H2S, CH3SH, and (CH3)2S, in the oral cavity. Unlike in the
control group, the test group indicates that gargling with mouthwash containing ClO2 is effective in
reducing halitosis.
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The 1st Physics and Technologies in Medicine and Dentistry Symposium IOP Publishing
IOP Conf. Series: Journal of Physics: Conf. Series 884 (2017) 012136 doi :10.1088/1742-6596/884/1/012136
Acknowledgement
This study was greatly supported by the Oral Epidemiology and Clinical Studies Research Cluster.
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