Most Replayed Moment: Mouthwash REVERSES The Benefits Of Exercise! Dr Nathan Bryan

What It Covers

Dr. Nathan Bryan explains how common oral hygiene habits — specifically antiseptic mouthwash and fluoride toothpaste — destroy the oral microbiome responsible for nitric oxide production, eliminating cardiovascular benefits of exercise and contributing to elevated blood pressure in two-thirds of Americans.

Key Questions Answered

• •Mouthwash and exercise: Antiseptic mouthwash eliminates the cardioprotective benefits of physical exercise by killing oral bacteria responsible for nitric oxide synthesis. Since nitric oxide dilates blood vessels and regulates blood pressure, two out of three Americans who use mouthwash daily are negating their workouts entirely, regardless of frequency or intensity.
• •Fluoride toxicity threshold: Standard toothpaste contains roughly 0.5mg of fluoride per pea-sized amount, but most people apply 10–20 times that quantity per brushing. The molecule is small enough (molecular weight 19) to absorb directly through oral tissue without swallowing, suppressing thyroid function and lowering children's IQ by up to seven points.
• •Tongue scraping and mouthwash combination: Tongue scraping increases oral microbiome diversity and improves nitric oxide production, but combining it with antiseptic mouthwash produces the worst possible outcome. Scraping opens tongue pores, allowing mouthwash to penetrate deeper into tissue and kill bacteria more effectively — eliminating the benefit and accelerating microbiome destruction.
• •Sugar and nitric oxide enzyme damage: Dietary sugar physically binds to nitric oxide synthase, the enzyme lining blood vessels, locking it in a fixed conformation and preventing nitric oxide production. This mechanism explains why diabetics face a tenfold higher incidence of heart attack, stroke, peripheral neuropathy, and non-healing wounds compared to non-diabetics.
• •Nitric oxide activation stack: Nasal breathing, 20–30 minutes of daily sunlight, humming at resonant frequencies, and red light or infrared therapy all stimulate nitric oxide synthase in sinus epithelial cells and blood vessel linings. Testosterone and estrogen also activate the enzyme, explaining why hormone replacement therapy carries measurable cardiovascular protective effects in both men and women.