Coffee Contains Natural Compound That Fights Bad Breath

If you’ve ever been told your morning coffee makes your breath worse, you’re not alone. The common belief is that coffee—especially when mixed with milk—dries out your mouth and leads to bacterial overgrowth, causing unpleasant odors. But what if coffee could actually help fight bad breath instead of causing it?

Yes, according to a study by Israeli scientists, certain compounds in coffee can significantly reduce the production of volatile sulfur compounds—the main culprits behind bad breath. In lab tests, coffee reduced these gases by up to 90%.

What Causes Bad Breath?

Bad breath, or halitosis, often starts in the back of your mouth—on the tongue, between teeth, and in gum pockets where bacteria thrive. These microbes break down proteins in food, releasing volatile sulfur compounds (VSCs) that smell like rotten eggs. Eating strong foods like garlic or onions makes it worse because their sulfur components enter your bloodstream, are exhaled through your lungs, and linger until fully eliminated. Most mouthwashes and gums only mask these smells temporarily.

The Surprising Coffee Experiment

Professor Mel Rosenberg, an expert in breath research at Tel Aviv University, initially set out to prove that coffee worsens bad breath. He and his team tested two locally produced Israeli coffees and one Nestlé instant coffee by mixing them with saliva in test tubes. They expected to find increased levels of foul-smelling gases. Instead, they observed the opposite: coffee inhibited the formation of these gases. In some trials, gas production dropped by as much as 90%.

How Coffee May Fight Bad Breath

Rosenberg believes specific, unidentified compounds in coffee prevent the bacteria in your mouth from producing VSCs. These active substances appear to interfere with the bacteria’s ability to generate the sulfur compounds that cause odor. Unlike mint or other flavorings that simply cover up smells, these coffee-derived compounds may stop bad breath at the source by reducing plaque buildup and bacterial activity.

The next step for Rosenberg’s team is to isolate the exact active molecules responsible for this effect. Their goal is to develop new formulations for mouthwash, chewing gum, and breath sprays using these coffee-based compounds—replacing temporary masking agents with something that prevents odor before it starts.

Frequently Asked Questions

Does coffee really reduce bad breath?

Yes, according to a study by Israeli scientists. Coffee was found to reduce the production of volatile sulfur compounds—the main cause of bad breath—by up to 90% in lab tests using saliva and different coffee types.

Which types of coffee were tested in the study?

The experiments used two locally produced Israeli coffees and one Nestlé brand instant coffee. All showed the potential to inhibit bad breath-causing gases when mixed with saliva.

Why do people think coffee causes bad breath?

Coffee is commonly believed to dry out the mouth and promote bacterial growth, especially when mixed with milk, leading to bad smells. This is still true in some cases, but the study revealed coffee also has compounds that fight odor.

How does coffee stop bad breath compared to mints or mouthwash?

Unlike mints or most mouthwashes, which only mask smells temporarily, the active compounds in coffee appear to stop the bacteria from producing the sulfur gases that cause bad breath in the first place.

Will coffee-based mouthwash be available soon?

Researchers are working to isolate the specific active substances in coffee that fight bad breath. Their goal is to create new oral care products, but commercial availability has not been confirmed yet.

Recommended FrontStreet Beans for Fresh Breath

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