Researchers noted increasing cases of gonorrhoea among men who had sex with men and sought to establish whether Listerine could protect against the bacteria that causes the infection.
Some strains gonorrhoea are developing resistance to antibiotics - making it tricky to treat.
The experts conducted a clinical trial involving 196 gay or bisexual men who had previously tested positive for gonorrhoea in their mouths and throat and were returning for treatment at a clinic in Melbourne, Australia.
Of these, 58 tested positive for the bacteria in their throats on their return visits between May 2015 and February 2016.
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Results showed the proportion of viable gonorrhoea in the throat was 52 per cent after rinsing and gargling with Listerine for one minute, compared with 84 per cent among the saline solution group.
The study, published in the journal Sexually Transmitted Infections, said: "Our data provides preliminary evidence to support the further investigation of mouthwash as a non-condom-based control measure for gonorrhoea.
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"Listerine mouthwash is a cheap, easy to use and effective agent that inhibits gonorrhoea growth and requires further careful consideration and study."
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Gonorrhoea can be easily passed between people through unprotected vaginal, oral or anal sex, as well as sharing vibrators or other sex toys that have not been washed or covered with a new condom each time they are used.
Not surprised, 'Listerine' is extremely strong, I can barely keep it in my mouth for how much is strong, you can also be found positive to alcohol test because there's a lot in there, so not surprised about his antibatteric power.