Does Hypochlorous Acid Mouthwash Help With Bad Breath?

|Marc Patterson
Clear measuring cup filled with hypochlorous acid oral rinse to the 1 oz mark for fresh breath and good daily oral hygiene

Does hypochlorous acid mouthwash help with bad breath?

Yes. Hypochlorous acid (HOCl) mouthwash can help with bad breath by helping reduce odor-causing bacteria in the mouth. These bacteria produce compounds that contribute to bad breath, so reducing them helps address a source of the odor rather than simply masking it with a strong flavor.

Why HOCl Can Help With Bad Breath

Certain bacteria in the mouth feed on food debris, dead cells, and proteins. As they break down this material, they release sulfur-containing gases called volatile sulfur compounds (VSCs), a major cause of bad breath.[1]

HOCl is an antimicrobial that helps reduce bacteria throughout the mouth. Human clinical research has shown that rinsing with HOCl can reduce salivary bacteria, including research evaluating a 100 ppm HOCl mouthwash.[2]

By helping reduce the bacteria that produce these odor-causing gases, HOCl can help reduce bad breath at one of its sources rather than simply covering the odor with a strong flavor.

How to Use HOCl Oral Rinse for Fresher Breath

Start by removing the buildup. Brushing, cleaning between teeth, and tongue cleaning help remove food debris, plaque, and buildup that can hold bacteria. Follow with an HOCl oral rinse to help further reduce bacteria throughout the mouth.

For fresher breath, HOCl oral rinse can be used in several ways:

  • Swish: Rinse around the teeth, along the gumline, and throughout the mouth.
  • Gargle: Extend the rinse toward the back of the mouth and throat.
  • Oral irrigator: Carry the rinse between teeth and along the gumline with a compatible device.

The goal is simple: remove buildup first, then use the rinse to help reduce odor-causing bacteria that remain. For complete guidance, see How to Use Hypochlorous Acid Oral Rinse.

When Bad Breath May Need More Than Mouthwash

Persistent bad breath can have causes beyond routine odor-causing bacteria, including gum disease and dry mouth. If bad breath continues despite consistent oral hygiene, a dentist can help identify the underlying cause.

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References

1. The Relationship Between Oral Malodor and Volatile Sulfur Compound-Producing Bacteria
Krespi YP, Shrime MG, Kacker A. Otolaryngology–Head and Neck Surgery. 2006. View Source | PubMed
Peer-reviewed review of the relationship between oral bacteria, protein breakdown, volatile sulfur compounds (VSCs), and bad breath.

2. Effects of Hypochlorous Acid Mouthwash on Salivary Bacteria Including Staphylococcus aureus in Patients With Periodontal Disease: A Randomized Controlled Trial
Lin YC, Tsai CF, Huang HL. BMC Oral Health. 2023. View Source | PubMed
Randomized controlled trial evaluating 100 ppm HOCl mouthwash and its effect on salivary bacterial counts.

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