I want to share something I was never taught in dental school but wish I had learned sooner.
It would have changed how I practiced from day one, and it may change how you think about your own health.
Your mouth isn’t dirty—it’s alive.
For years I was taught to treat the mouth like a battlefield: kill the bacteria, disinfect, and fill the holes. That framing is incomplete and often harmful.
Your mouth is an ecosystem in constant communication with your blood, your gut, and even your brain. When gums bleed—even slightly—that creates a doorway for microbes to enter the bloodstream and influence other systems in the body.
A few connections researchers have observed:
Fusobacterium nucleatum has been identified in colorectal tumors.
Porphyromonas gingivalis has been detected in brains affected by Alzheimer’s disease.
People with gum disease have higher rates of inflammatory bowel disease.
In this article I want to persuade patients, clinicians, and hygienists that traditional dentistry’s one-size-fits-all war on microbes misses the bigger picture—and to offer practical alternatives.
Please stop carpet-bombing your mouth.
You’ve seen those ads with blue liquid swirling through the mouth, promising to kill everything in its path. We now understand that indiscriminately wiping out oral microbes causes harm.
Regular use of antiseptic mouthwashes—even many that are marketed as “natural”—can:
- reduce microbial diversity
- acidify saliva
- eliminate nitrate-reducing bacteria
- suppress nitric oxide production
Nitric oxide helps keep blood vessels relaxed, supports healthy blood pressure, aids athletic performance, and influences sexual function. One study showed beetroot juice lowered blood pressure in older adults—except in those who had been using antiseptic mouthwash, where the effect disappeared.
If you are addressing blood pressure, sleep apnea, or recovery, avoiding routine antiseptic mouthwash is an easy, evidence-informed change to try.
The mouth and gut are connected
You swallow roughly 1.5 liters of saliva every day, along with its microbes. While many oral microbes are killed by stomach acid, some survive and, especially when gums are inflamed, more bacteria gain access to the bloodstream.
Research shows oral microbes such as Klebsiella and Fusobacterium can colonize the gut and contribute to inflammation. In people with inflammatory bowel disease these organisms have been detected in inflamed intestinal regions, and animal models show gum pathogens can worsen colitis. This oral–gut axis means gum health can influence gut behavior and systemic inflammation.
A simple alternative: green tea
When asked what to use instead of antiseptic mouthwash, I often recommend a glass of green tea. Polyphenols in green tea:
- make it harder for cavity-causing bacteria to adhere
- reduce the ability of gum disease bacteria to latch on
- thin biofilm without eradicating beneficial species
- decrease compounds that cause bad breath
- support nitrate-reducing bacteria that help produce nitric oxide
Of course, sugar matters—excess sugar feeds cavity-causing bacteria—but focusing only on avoidance misses the positive role of foods that build resilience in the mouth.
Foods that support a healthy oral ecosystem include:
- Nitrate-rich plants: arugula, beets, spinach, celery
- Fermented foods: yogurt, kefir, kimchi, miso
- Polyphenol-rich foods: berries, cacao, cranberries, pomegranate
These foods help teeth and gums and influence the gut, brain, and vascular system through the oral–gut axis.
My at-home routine
- Tongue scraping
- Rinsing with warm saltwater, MCT or coconut oil (oil pulling), or plain water
- (Note: avoid rinsing immediately after brushing with nano-hydroxyapatite toothpaste so the mineral can remain on teeth and work.)
- Brushing with nano-hydroxyapatite toothpaste
- Drinking green tea between meals to help restore pH
- Prioritizing nasal breathing day and night to maintain steady saliva flow and ecosystem balance
- Eating plenty of fermented foods, like sauerkraut
- Using targeted oral probiotics: certain Streptococcus salivarius strains can help with bad breath and gingival health
- Preparing nutrient-dense breakfasts that support the oral microbiome
If you’re curious about your own oral ecosystem, salivary oral microbiome tests can indicate whether beneficial nitrate-reducers are present or if potential pathogens like P. gingivalis are overabundant. Such tests can guide targeted, non-destructive care.
Why invest in your oral microbiome?
- Potential to lower blood pressure without additional medication
- Improved sleep and fewer sleep apnea events
- Fresher breath
- Better outcomes in pregnancy, cognitive health, and metabolic wellness
- Stronger teeth and healthier gums as you age
P.S. Know someone who could use an oral microbiome reset? Forward this to them. They can sign up for future newsletters if they’d like to receive more updates and practical tips.