Oral Health and Longevity: Why Your Gums Affect Your Brain, Heart and Bones
Your toothbrush cleans only about 60% of your mouth, leaving the dirtiest 40% behind. Slate co-founder Brynn Maclennan joins Dr. Vonda Wright to explain how bacteria from unhealthy gums can travel to the brain, heart and gut, and why daily gum stimulation, flossing and tongue cleaning support whole-body health, especially for women in midlife.
Overview
In this episode of the Dr. Vonda podcast, orthopedic surgeon and longevity advocate Dr. Vonda Wright sits down with Brynn Maclennan, co-founder and CEO of the oral care company Slate, to connect something most of us overlook, our mouth, to whole-body health. Maclennan explains that a toothbrush cleans only about 60% of the mouth, leaving the dirtiest 40% around the gumline untouched. They discuss how bacteria from inflamed, bleeding gums can enter the bloodstream and travel to the brain, heart and gut, tying poor oral health to dementia, heart-valve infections like endocarditis, and even erectile dysfunction.
A recurring theme is the midlife window: as women lose estrogen, gums grow drier and bleed more easily, and roughly one in four women can lose a tooth during perimenopause. Maclennan describes how plaque hardens into tartar in under 48 hours, becoming like sandpaper beneath the gums, and why gum stimulation, tongue cleaning and consistent flossing matter more than any single gadget. They compare water flossers to a touchless car wash and stress that string floss is still needed between the teeth.
The conversation also covers pregnancy gingivitis, the loss of finger dexterity that makes flossing harder after 50, and simple motivations, from fresher breath to whiter teeth, that help build a daily habit. Throughout, the message stays preventative and practical: small, consistent oral care today helps protect the brain, heart and jawbone for decades to come. This content is for general wellness education and is not medical advice.
Key quotes
5Your toothbrush only cleans 60% of your mouth. That means you're leaving behind the dirtiest 40%.
50% of Americans have gum disease. And then when you're 60, it's 70%.
Plaque turns into tartar in less than 48 hours. So it becomes like sandpaper underneath your gums.
That mouth is part of the whole system. It's the entryway to the whole body.
Your body's trying to help you, but all you have to do is wash your sweater and then your gums are going to be healthy.
Key ideas
8The mouth is the body's entryway
Maclennan describes learning that the mouth connects directly to whole-body health, and that bacteria in the gums can reach the brain, heart and gut. Oral care, she argues, deserves the same attention as diet and exercise.
Gum disease is extremely common
About half of American adults have gum disease, rising to roughly 70% by age 60, even among active, health-conscious people. Many do not connect this to their overall health.
Bleeding gums open a door to the bloodstream
When gums bleed, bacteria can enter the blood and settle on heart valves, contributing to infections like endocarditis. Maclennan shares a story of a mother of eight who died after a tooth infection.
Midlife estrogen loss worsens gum health
As women lose estrogen, gums become drier and bleed more easily on top of age-related gum issues. Bleeding is a sign of inflammation, not a reason to stop flossing.
Plaque hardens into tartar in 48 hours
Soft plaque turns hard in under two days and slips beneath the gumline like sandpaper. Regular flossing gradually removes it, while a hygienist clears what remains.
Oral bacteria are linked to dementia
The bacterium Porphyromonas gingivalis has been found in the brains of many Alzheimer's patients, pointing to a strong correlation between gum disease and dementia. Reducing bacterial load lowers inflammation throughout the body.
Brushing misses the dirtiest 40%
A toothbrush cleans only the surfaces of the teeth, not the cracks where gum and tooth meet. Stimulating the gumline and cleaning the tongue disrupts the biofilm brushing leaves behind.
Pregnancy and hormones raise the stakes
According to the CDC, more than 60% of women experience pregnancy gingivitis, which is linked to preterm labor and low birth weight. Hormonal shifts in pregnancy and menopause both increase oral inflammation.
Practical takeaways
6- 1
Do not stop flossing when gums bleed 20:00
Bleeding usually signals inflammation and tartar friction, not damage. Consistent flossing reduces the bleeding over time as the gums grow healthier.
- 2
Stimulate the gumline, not just tooth surfaces 29:30
The most important part of flossing is stimulating where gum and tooth meet. Gum stimulation, not just clearing food, is what disrupts the harmful biofilm.
- 3
Clean your tongue every day 30:30
The white coating on the tongue is biofilm that fuels bad breath and bacteria. Scraping or brushing the tongue removes much of the bad bacteria.
- 4
See a hygienist regularly 43:30
Visit a dental hygienist every six months, or every three months if you have gum disease. Professional cleaning removes hardened tartar you cannot reach at home.
- 5
Do not rely on mouthwash alone 44:30
Alcohol-based mouthwash cannot replace physical cleaning and may disrupt the good bacteria your mouth needs. Flossing, gum stimulation and tongue cleaning do the real work.
- 6
Make it a 30-second daily habit 47:30
Consistency matters more than perfect technique, and effective flossing can take 30 seconds. Keep your tools wherever you will actually use them, from the bedside to the car.
Topics & chapters
13Cold open: your toothbrush misses 40%
Maclennan opens with a jolt: a toothbrush cleans only about 60% of the mouth, leaving the dirtiest 40% behind.
Meet Brynn Maclennan and Slate
Dr. Wright welcomes the co-founder and CEO of Slate to continue an earlier conversation about how mouth health shapes whole health.
The lightbulb: mouth bacteria travel body-wide
Maclennan recalls the continuing-education course that revealed how bacteria move from the gums to the brain, heart and gut.
How common gum disease really is
Half of American adults have gum disease, rising to about 70% by age 60, even among healthy, active people.
Bleeding gums, endocarditis and the heart
Bacteria from bleeding gums can settle on heart valves like barnacles, illustrated by a story of a mother of eight who died of endocarditis.
Estrogen loss and midlife gum bleeding
As women lose estrogen, gums dry out and bleed more; bleeding is a sign of inflammation, not a reason to stop flossing.
Plaque to tartar: the 48-hour sandpaper
Plaque hardens into tartar in under 48 hours, forming a sandpaper-like layer under the gums that a hygienist must remove.
Dementia, ED and whole-body inflammation
The bacterium Porphyromonas gingivalis has been found in Alzheimer's brains, and gum disease is tied to heart risk and erectile dysfunction.
The missing 40%: gum brushes and tongue
Slate's patented gum brushes stimulate the gumline, while a two-row tongue scraper disrupts the white biofilm.
Halitosis and finding your motivation
Bad breath comes from the tongue or gum pockets, and whatever motivates you, from health to fresh breath, can drive the habit.
Losing teeth in perimenopause: the sweater analogy
Maclennan compares the gum to a stretched turtleneck where bacteria hide, and explains how the body's own cells can erode jawbone.
Water flossers, dexterity and the right order
A water flosser is like a touchless car wash; string floss is still needed for cavities, and a dentist's order is floss, brush, then tongue scrape.
Building Slate, and flossing for life
From a Kickstarter and 700 dental professionals to retail shelves, the goal was easy daily prevention so you keep your teeth at 90.