Some ingredients in coffee can suppress the benefits of bad breath and drinking coffee.

Experts accidentally discovered this magical effect of coffee in the experiment. Previously, it was generally believed that drinking coffee would make your breath bad. In fact, when coffee and milk are mixed, they dehydrate the inside of the mouth and ferment to produce smelly substances. The team took two types of Arabica coffee and placed them in glass tubes filled with saliva. They initially hoped the experiment would prove that coffee mixed with saliva produced a smelly gas.

The results were unexpected. The researchers found that coffee prevented the production of "odors" and in some experiments, coffee reduced "odors" by 90%. "We predicted that coffee would cause bad breath, but in fact during this magic brewing process, certain components of coffee were found to inhibit bad breath," the researchers said.

Scientists believe bad breath is inevitable, and even the healthiest of us wake up with bad breath. Oral cavity tongue, tooth socket and other parts are plaque "paradise", this bacteria can produce volatile sulfur compounds, make the mouth emit odor; if you eat onions, garlic and other heavy taste of food, bad breath will last longer, because the blood will absorb these food components, and then enter the lungs, and then exhale.

The researchers plan to isolate the coffee's halitosis-suppressing wonder substance, which they believe inhibits plaque formation and blocks bad breath at its source. It could replace breath mint as the basis for a new generation of mouthwashes, breath fresheners and chewing gum. Traditional mouthwash and chewing gum can only cover up halitosis for a short time and cannot completely eliminate it.