How Coffee Can Help Reduce Bad Breath

Ever finished a cup of coffee, only to worry it might leave you with bad breath? Ironically, while many blame coffee for causing unpleasant mouth odors, a surprising body of research suggests it may actually help fight the very problem it’s accused of creating.

Yes—coffee can reduce bad breath. In fact, Israeli scientists found that coffee inhibits up to 90% of the compounds responsible for foul-smelling breath, especially those volatile sulfur compounds produced by oral bacteria.

Why Do We Get Bad Breath?

Bad breath, or halitosis, often starts in the back of your mouth—particularly on the tongue and in the gum pockets around your teeth. These areas are hotspots for bacterial growth, especially a type that creates volatile sulfur compounds (VSCs). These compounds are what give off the rotten-egg smell we associate with bad breath. Eating strong foods like onions and garlic makes it worse, because after digestion, their odor-causing elements enter your bloodstream, travel to your lungs, and get exhaled.

The Surprising Coffee Discovery

In an unexpected finding, researchers at Tel Aviv University in Israel discovered that coffee contains compounds that suppress the production of these foul-smelling VSCs. Led by Professor Mel Rosenberg, an expert in breath research, the team conducted experiments using two locally produced Israeli coffees and one instant coffee variety. They added these to test tubes containing saliva and observed the results. The findings were clear: coffee inhibited up to 90% of the bacteria-driven compounds that cause bad breath. "We’ve always heard that coffee causes bad breath," said Rosenberg, "but our research shows certain components in coffee can actually suppress it."

How to Use Coffee Against Bad Breath

So, should you just drink more coffee? According to experts, yes—and maybe more. Drinking coffee in moderation contributes to oral freshness, likely due to the same anti-bacterial compounds identified in the study. But there’s more: rinsing your mouth with black coffee may also help. Nutrition expert Wang Xingguo from the Dalian Nutrition Society noted that both coffee and tea contain chemicals that combat odor-causing agents. He specifically recommended using coffee as a mouth rinse for similar effectiveness. Just keep it black—added milk or sugar can negate the benefits or even promote bacterial growth.

Coffee vs Mint: The Future of Fresh Breath?

Rosenberg isn’t stopping at discovery. His next goal is to isolate the specific compounds in coffee that fight bad breath and use them as the foundation for better breath fresheners. That means future mouthwashes, chewing gums, and breath sprays could rely on coffee-derived ingredients rather than simply masking agents like mint. If successful, these products could offer longer-lasting and more targeted freshness compared to what’s currently on the market.

Frequently Asked Questions

Does coffee really reduce bad breath or does it just mask it?

Coffee doesn’t just mask bad breath—it actively inhibits the production of volatile sulfur compounds (VSCs) that cause it. Research from Tel Aviv University showed coffee reduced VSCs by up to 90%, meaning it tackles the root cause, not just the smell.

What did the Israeli study find about coffee and oral bacteria?

Israeli researchers tested regular and instant coffee in saliva samples and found that coffee prevented up to 90% of the bacterial processes that lead to bad breath. The effect was attributed to specific compounds in coffee that suppress odor-producing bacteria.

Is it better to drink coffee or rinse with it for fresher breath?

Both methods can help. Drinking coffee in moderation contributes to reducing bad breath through its antibacterial compounds. Rinsing with black coffee may also be effective, especially since it allows the active compounds to remain in contact with oral surfaces.

Can eating garlic or onions make coffee ineffective against bad breath?

No, but those foods introduce sulfur compounds into your bloodstream, which are then exhaled through your lungs. Coffee may reduce oral bacteria-related odors, but food-based odors require other strategies—like avoiding those foods or waiting for them to clear your system.

Will adding milk or sugar to coffee reduce its breath-freshening effects?

Possibly. Adding milk or sugar can promote bacterial growth in the mouth, which might counteract coffee’s natural antibacterial benefits. For best results, use black coffee—whether drinking or rinsing.

Are coffee-based mouthwashes or gums already available?

Not yet. The study’s lead researcher, Professor Rosenberg, is working to isolate the active compounds in coffee for use in future breath fresheners, including mouthwashes and chewing gums, which could replace traditional mint-based products.

Recommended FrontStreet Beans for Fresh Coffee

Try FrontStreet Coffee’s Ethiopia Humbera for a bright, juicy profile with bergamot and stone fruit—perfect for stimulating saliva and reducing oral stagnation. Their Yirgacheffe offers floral and citrus notes that refresh the palate, while the PWN Golden Mandheling delivers a smooth, sweet body with hints of honey and malt for a clean finish. All three promote a naturally clean-mouth feel. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.