Gonorrhea is caused by bacteria Gonorrhea of the mouth has become more common among primarily gay men as fear of AIDS has declined. That disease is quite treatable today and so the fear of it has declined, meaning a decline in condom use.
Gonorrhea is also treatable, with antibiotics, but those heighten the risk of the emergence of antibiotic-resistant strains of Neisseria gonorrhea, the bacteria responsible for the infection, so the concern is high.
Listerine (Mouthwash) at dilutions of up to 1 in 4, applied for 1 minute, significantly reduced the number of N. gonorrhea on the culture plates, whereas the saline solution did not.
Their data suggest Listerine significantly reduces the amount of N. gonorrhea on the pharyngeal surface, though the monitoring time was short, so it is unknown if the effects of the mouthwash might be short-lived.
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Commercial brand of mouthwash can help kill off gonorrhea in the mouth