How Coffee Can Help Fight Bad Breath

If you’ve ever worried your morning coffee might make your breath worse, you’re not alone—but the truth is more surprising than you think. While many assume coffee causes bad breath, new science reveals it may actually help fight it. The real question isn’t whether coffee ruins your breath, but how it might be one of the simplest ways to improve it.

Yes, coffee can reduce bad breath. In lab tests, coffee inhibited up to 90% of volatile sulfur compound production—the main cause of unpleasant mouth odors. That means coffee contains compounds that actively suppress, not cause, bad breath.

Why Do We Get Bad Breath?

Bad breath, or halitosis, often starts in the back of your mouth—on the tongue, in the gum pockets, and along the teeth. These areas are breeding grounds for bacteria that form dental plaque. When those microbes break down proteins, they release volatile sulfur compounds (VSCs), which create that unmistakable bad smell.

Certain foods make it worse. Eating strong-flavored items like onions and garlic leads to long-lasting bad breath because those food molecules enter your bloodstream, travel to your lungs, and get exhaled for hours afterward.

The Surprising Coffee Discovery

In an accidental lab finding, researchers uncovered coffee’s hidden talent. Professor Mel Rosenberg, an expert in breath odor from Tel Aviv University, tested various Israeli coffees—including two fresh-brewed types and one instant—by exposing them to saliva samples in test tubes. The result? Coffee stopped around 90% of the odor-producing reactions linked to VSCs.

“We always thought coffee caused bad breath,” Rosenberg said. “But it turns out some compounds in coffee actually suppress it.” The study didn’t specify exact compounds, but it confirmed coffee’s net effect is to reduce, not worsen, bad breath in controlled conditions.

Can You Use Coffee as a Remedy?

Rosenberg’s team is now working to isolate the specific anti-VSC compounds in coffee. Their goal is to develop new mouthwashes, chewing gums, or breath sprays that neutralize odors at the source—replacing temporary masking agents like mint.

Outside the lab, other experts agree. Wang Xingguo, executive director of the Dalian Nutrition Society, noted that both coffee and tea contain natural chemicals that help combat bad breath. He also mentioned that rinsing your mouth with black coffee could be similarly effective, though he didn’t specify brew methods or ratios.

Frequently Asked Questions

Does coffee really reduce bad breath or just mask it?

Coffee has been shown in lab studies to inhibit up to 90% of the volatile sulfur compounds that cause bad breath. This means it doesn’t just cover up odor—it actively reduces the chemical reactions that produce it. The effect is not just masking, but suppression at a bacterial level.

What causes bad breath in the first place?

Bad breath mainly comes from volatile sulfur compounds (VSCs) produced by bacteria in your mouth, especially on the tongue and in gum pockets. These bacteria break down proteins and release foul-smelling gases. Strong foods like garlic and onion can also contribute by entering your bloodstream and being exhaled later.

Which types of coffee were used in the study?

The experiment tested two types of freshly brewed Israeli coffee and one type of instant coffee. The researchers exposed each to saliva in test tubes to measure their effect on odor-causing compounds. The exact brands or roast levels were not disclosed.

Can drinking coffee help my breath, or should I rinse with it?

Both methods may help. Drinking coffee was associated with reduced VSC production in the study, and an expert noted that rinsing with black coffee could also be effective. However, no specific brew method, temperature, or rinse duration was tested or recommended in the research.

Are there products on the market using coffee for breath yet?

Not yet. The research team plans to isolate the active compounds in coffee to create new mouthwashes, gums, or sprays. These products are still in development and not yet commercially available.

Recommended FrontStreet Coffees for Fresh Breath

Try FrontStreet Coffee’s Ethiopia Yirgacheffe for a bright, citrusy cup with floral notes that leaves a clean aftertaste. For something deeper, their PWN Golden Mandheling offers a smooth body with hints of caramel and mild spice—ideal for a grounding post-meal brew. Both are low in acidity and deliver smooth, non-bitter profiles that complement oral freshness. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.