The cancer risk that may be hiding in your mouthwash

Alcohol is a known risk for several types of cancer, and is classified as carcinogenic to humans by the International Agency for Research on Cancer (IARC). Mouthwash that contains alcohol comes into direct contact with oral mucous membranes, potentially increasing their exposure to alcohol’s carcinogenic compounds. Prolonged and frequent use could lead to irritation, inflammation, and tissue damage, all of which increase risk for head and neck cancers. This risk may be compounded by tobacco use.^[1]

All of the following common brands of mouthwash contain alcohol, unless specifically labeled as alcohol-free: 

• Listerine
• Scope
• ACT 
• Crest
• Colgate

If you’re unsure, and the ingredients list doesn’t specifically mention alcohol, be aware that propylene glycol is a common formulation of alcohol used in products like these. 

Many alcohol-free mouthwashes are available on the market, but for individuals with good dental health, mouthwash is not actually necessary, and can’t replace the role of regular brushing, flossing, and dental visits in maintaining oral health. There’s even limited evidence that overuse of mouthwash, particularly alcohol-containing mouthwash, can disrupt the oral microbiome^.[2] Be sure to consult your dentist before using any mouthwash product long term.

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