The old adage “watch your mouth” takes on a chilling new meaning regarding the products we use to clean and freshen our breath. For many of us, the memory of being told to “watch our mouth” as children is still vivid, often accompanied by the sharp sting of soap on the tongue for uttering forbidden words like “damn” or worse. As unpleasant as those moments were, they served as a deterrent—a way to discourage foul language and instill discipline. Still, today, the stakes feel infinitely higher.
The unsettling possibility looms that people might now be rinsing their mouths with a product linked to cancer, according to a class action lawsuit.
Mouthwash has long been a staple in many households, promising fresh breath and a clean mouth. For years, Listerine, a product of Johnson & Johnson, has been the gold standard in oral hygiene. However, recent developments have thrust this iconic brand into a swirling controversy that questions whether our trust in this product has been misplaced. A class action lawsuit has been filed against Johnson & Johnson, alleging that their popular mouthwash contains bacteria linked to cancer, leaving many to wonder: Could something marketed as essential to health be causing harm?
The lawsuit claims that Johnson & Johnson knowingly sold Listerine despite evidence suggesting a potential link between its use and cancer-causing bacteria. Plaintiffs allege that internal documents reveal the company was aware of the risks as early as 2005 but continued marketing the product without warnings. Expert testimony has added weight to the case, pointing to certain bacteria linked to Listerine that may cause DNA damage and increase cancer risk. The case, currently in the discovery phase, appears to be building on substantial evidence, but a resolution remains pending.
The research adds more fuel to this fire. A study published in the Journal of Medical Microbiology examined the effects of daily use of Listerine Cool Mint on the oral microbiome. The findings were unsettling: participants exhibited a significant increase in bacteria such as Fusobacterium nucleatum and Streptococcus anginosus after just three months. These bacteria have been implicated in diseases ranging from gum disease to esophageal and colorectal cancers. While the study was limited by its small sample size and short duration, it underscores the need for further investigation and caution among consumers.

Listerine’s controversy isn’t happening in a vacuum.
The oral care industry has faced scrutiny for years, with other companies like Colgate-Palmolive and Procter & Gamble embroiled in similar lawsuits. Colgate’s PerioGard and Crest’s Pro-Health have been accused of containing chemicals linked to cancer and hormone disruption. Yet, the Listerine case feels particularly troubling given the product’s ubiquity and reputation as a trusted brand.
Johnson & Johnson is no stranger to legal battles.
Over the years, the company has faced more than 100 class action lawsuits, ranging from claims about talcum powder’s alleged links to ovarian cancer to allegations of defective hip replacements. While it has settled or won many of these cases, the sheer volume raises questions about transparency and consumer safety.
The history of mouthwash itself adds an ironic twist to the Listerine saga. Developed in 1879 as a surgical antiseptic, Listerine was later rebranded for oral hygiene. It has been synonymous with health for generations, but the recent revelations cast a shadow over that legacy. Bad breath, or halitosis, was the original target of mouthwashes like Listerine. However, as science advances, we learn that quick fixes may come with hidden costs.
Consumers looking for alternatives might find solace in natural remedies. Practices like oil pulling with coconut or sesame oil, rinsing with salt water, or hydrogen peroxide solutions offer safer options. Essential oils such as peppermint and tea tree oil, known for their antimicrobial properties, are also gaining popularity as DIY mouthwash ingredients.
Choosing products with transparent ingredient lists or consulting dental professionals can also help mitigate potential risks. The case against Johnson & Johnson highlights broader concerns about consumer trust and corporate responsibility.
How much do we really know about the products we use daily and how often are we kept in the dark about potential risks? The answers may not just shape the outcome of this lawsuit but could also redefine our approach to oral care for years to come. In the meantime, it’s worth pausing to read the labels, question the marketing, and prioritize informed choices over convenience.
Suppose this country considered health as true wealth. Would billions be spent on washing our brains with marketing and branding to purchase products that, rather than promoting wellness, line the pockets of large corporations? How did we go from trusting products that promised health benefits to buying into dangerous marketing tactics that ignore long-term consequences?
The answer lies in a culture where convenience and profit trump well-being. Until consumers demand more transparency and accountability, the companies benefiting from this cycle will continue to reign. As we wait for legal resolutions and scientific clarity, perhaps the real power lies not in what we buy but in how we question what we put in our bodies every day.