A routine step in millions of morning hygiene routines is now under scrutiny after a veteran US dentist warned it could be quietly affecting heart health. Dr Mark Burhenne, a San Francisco–based dentist with four decades of clinical experience, has cautioned that frequent use of antibacterial mouthwash may interfere with the body’s natural processes that help regulate blood pressure.
For years, mouthwash has been promoted as a finishing touch for oral cleanliness, promising to eliminate nearly all bacteria in the mouth. However, Dr Burhenne says this “kill-all” approach may be doing more harm than good. According to him, many popular mouthwashes destroy not only harmful bacteria but also beneficial oral microbes that play a key role in producing nitric oxide, a compound essential for healthy blood vessels and normal blood pressure.
In a recent social media post, Dr Burhenne explained that nitrate-reducing bacteria in the mouth help the body convert dietary nitrates into nitric oxide. When these bacteria are wiped out, the body’s ability to regulate blood pressure and support cardiovascular function may be reduced. He described widely used antiseptic mouthwashes as “indiscriminate,” claiming they disrupt the natural oral microbiome in the pursuit of extreme cleanliness.
Backing his concerns, Dr Burhenne pointed to multiple studies that suggest potential systemic effects. Research cited by him indicates that using mouthwash twice daily has been associated with a significantly higher risk of developing high blood pressure and blood sugar disorders over time. One study from the University of Plymouth reportedly found that mouthwash use could eliminate more than half of the blood pressure–lowering benefits gained from exercise within just a couple of hours.
He also questioned why these findings are not more widely discussed, suggesting that the focus on a sterile mouth has overshadowed the importance of microbial balance. For people already dealing with hypertension or metabolic issues, he believes this small daily habit could be an overlooked contributor to long-term health problems.
Dr Burhenne’s comments have sparked debate online, with experts urging readers to remember that such claims should be discussed with qualified medical and dental professionals. While mouthwash can be helpful in certain cases, its routine and frequent use may not be necessary for everyone.
Note: This article is based on statements shared on social media and is intended for general information only. It is not a substitute for professional medical advice.
