Coconut oil can help reduce bad breath, though the evidence is stronger for some mechanisms than others. The practice of “oil pulling,” where you swish coconut oil around your mouth for 10 to 20 minutes, has been shown to lower overall bacterial counts in saliva and reduce tongue coating, both of which contribute to oral malodor. It’s not a replacement for brushing and flossing, but it appears to be a useful add-on.
Why Coconut Oil Works Against Oral Bacteria
About half of coconut oil is lauric acid, a fatty acid that breaks down into a compound called monolaurin in the body. Monolaurin disrupts bacterial cell membranes, effectively killing certain microorganisms. Lab studies confirm that oral bacteria, particularly Streptococcus species, show high susceptibility to coconut oil. The oil also has documented activity against Candida species (yeasts that can overgrow in the mouth) and Staphylococcus aureus.
Bad breath typically originates from bacteria on the tongue and between teeth that produce sulfur compounds as they break down food particles. By reducing the overall bacterial load in your mouth, coconut oil can lower the concentration of those odor-causing compounds. A meta-analysis of clinical trials found that oil pulling significantly reduced salivary bacterial colony counts compared to control groups.
What the Clinical Evidence Shows
The most direct evidence for bad breath specifically comes from a randomized controlled trial comparing oil pulling to chlorhexidine, the antiseptic mouthwash dentists often recommend. That study found no significant difference between the two: oil pulling was equally effective as chlorhexidine at reducing oral malodor scores, both by objective measurement and by subjective smell assessment. Both performed significantly better than placebo.
That trial used sesame oil rather than coconut oil, which is worth noting. Coconut oil has been tested more extensively for its effects on tongue coating and bacterial counts. In one randomized trial, coconut oil pulling reduced tongue coating scores (measured using a standardized index) from 1.85 at baseline to 1.53 after 14 days. That reduction was statistically significant and comparable to what chlorhexidine achieved. Since tongue coating is one of the primary drivers of bad breath, this is a meaningful finding.
Where the evidence gets weaker: oil pulling did not significantly reduce plaque buildup or gum inflammation scores compared to controls in the meta-analysis. It also didn’t significantly lower counts of Streptococcus mutans specifically, even though overall bacterial counts dropped. So the benefits seem more about reducing the general bacterial population than targeting any single species.
How to Do Oil Pulling Correctly
The standard method is straightforward. Take about one tablespoon of coconut oil and swish it around your mouth, pushing and pulling it between your teeth, for 15 to 20 minutes. If your jaw gets tired, even 5 to 10 minutes can be beneficial. Do this in the morning on an empty stomach, before brushing your teeth. For children over five, use a teaspoon instead.
When you’re finished, spit the oil into a trash can (not the sink, since coconut oil solidifies and can clog pipes). Do not swallow the oil, as it will be full of bacteria by that point. Follow up with your normal brushing and flossing routine. Some practitioners recommend doing this up to three times daily before meals for faster results, though once in the morning is the most common approach in clinical studies.
The 15 to 20 minute duration matters. Shorter sessions haven’t been well studied, and the mechanical action of swishing for that length of time is likely part of what makes it work. The oil traps bacteria and debris as you push it around your mouth, and that takes time to be thorough.
What Coconut Oil Won’t Do
Oil pulling is not a substitute for brushing, flossing, or professional dental care. The meta-analysis data makes this clear: while bacterial colony counts dropped, plaque and gum inflammation scores did not improve compared to controls. If your bad breath is caused by gum disease, cavities, or an infection, coconut oil won’t address the underlying problem.
It’s also worth knowing that the research on coconut oil’s antimicrobial effects hasn’t been tested against Porphyromonas gingivalis, one of the primary bacteria responsible for the sulfur compounds that cause severe halitosis. Coconut oil’s proven activity is strongest against Streptococcus species and Candida yeasts. Its effectiveness against the full range of odor-causing bacteria in the mouth remains an open question.
Persistent bad breath that doesn’t improve with good oral hygiene often signals something deeper: gum disease, dry mouth, a sinus issue, or occasionally a digestive condition. Coconut oil pulling is reasonable to try for mild, everyday bad breath, but it won’t resolve these causes.
Safety Considerations
For most people, oil pulling is safe. The main risk is accidentally inhaling the oil into your lungs, which can cause a rare condition called lipoid pneumonia. Two documented cases involved patients who habitually swished oil (sesame oil in those cases) and frequently aspirated small amounts during the process. One patient had also been using the oil for nasal washing, which increases the risk significantly. Chronic cases of lipoid pneumonia often cause minimal symptoms but can be serious if acute.
To minimize this risk, stay upright while swishing and avoid talking or laughing with oil in your mouth. If you have difficulty swallowing, a strong gag reflex, or any condition that affects your airway, oil pulling may not be appropriate for you. Start with a smaller amount of oil if a full tablespoon feels unmanageable.
How It Compares to Other Options
If your main goal is reducing bad breath, a tongue scraper works faster and more directly. Tongue scraping physically removes the bacterial film that produces odor, and it takes about 30 seconds. Oil pulling takes 15 to 20 minutes and works more gradually by lowering the overall bacterial population. The two aren’t mutually exclusive, and using both together is a reasonable approach.
Compared to chlorhexidine mouthwash, oil pulling appears to perform similarly for bad breath based on the available trial data. Chlorhexidine, however, can stain teeth and alter taste with long-term use, which makes coconut oil an appealing alternative for people who want to avoid those side effects. Standard alcohol-based mouthwashes can also dry out the mouth over time, potentially making bad breath worse. Coconut oil doesn’t carry that risk.
The bottom line is that coconut oil pulling is a legitimate tool for managing bad breath, supported by a modest but real body of clinical evidence. It works best as part of a broader oral hygiene routine rather than a standalone solution, and it requires a time commitment that other methods don’t. But if you’re willing to dedicate 15 to 20 minutes each morning, the research suggests it will make a noticeable difference.