But not always. Rosenberg and colleagues monitored the bacterial odor production of coffee in saliva.

“Contrary to our expectations, we found some components in coffee that actually inhibit bad breath,” Rosenberg said.

Rosenberg would like to isolate the bacteria-inhibiting molecule in order to reap the biggest anti-bacterial benefits from coffee. “It’s not the raw extract we will use,” he says, “but an active material within it.”

An extract from coffee can inhibit the bacteria that lead to bad breath, scientists have discovered.

The extract prevents malodorous bacteria from making their presence felt — or smelt.

The discovery could be the foundation for an entirely new class of mouthwash, breath mints and gum, he said.

The findings were presented last month to members of the International Society for Breath Odor Research in Germany.