Mouthwashes are effective adjuncts to oral hygiene practices like brushing and flossing. Although they eliminate the harmful oral bacteria, frequent use may lead to oral microbiome dysbiosis, increased bacterial resistance and systemic health complications like Hypertension.
Disruption of Nitric oxide production
The primary concern lies in the disruption of the Nitrate-Nitrite-Nitric Oxide pathway.
Antiseptic mouthwashes, on chronic use, indiscriminately kill the beneficial intraoral bacteria that converts dietary nitrates to nitrites. When swallowed, these nitrites are converted to Nitric oxide, a potent vasodilator. Nitric oxide relaxes the vascular smooth muscles, widens blood vessels, improves the blood flow, thereby reducing the blood pressure.
By killing the “good” bacteria, mouthwash halts this process, leading to constricted vessels and higher blood pressure.
Common culprits
· Chlorhexidine- Most potent offender
A study found that using 0.2% chlorhexidine mouthwash twice daily for one week led to reduction in salivary nitrite levels by 90% and raised systolic blood pressure by 2–3 mmHg.
· Cetylpyridinium Chloride (CPC)- Research suggests that using CPC mouthwash twice daily may increase the risk of developing pre-diabetes or hypertension by up to 55% over three years.
· Alcohol based mouthwashes- The general “antibacterial” nature of these rinses contributes to microbiome dysbiosis, which may indirectly affect blood pressure.
Conclusion
Antibacterial mouthwashes should be treated like “targeted medication” rather than daily toiletries. Unless prescribed for a specific short-term condition like gingivitis, periodontitis or post-surgery healing, they should be avoided for long-term use.
For daily freshness, non-antiseptic rinses or those containing essential oils are considered safer alternatives that preserve cardiovascular health 
by protecting the oral microbiome.
MBH/PS
