Andrew Huberman — Professor of neurobiology and ophthalmology at Stanford School of Medicine and host of the Huberman Lab podcast. This is a solo episode in which he synthesizes input from five dentists he consulted.
The gist
In this solo episode, Andrew Huberman argues that oral health is a critically overlooked seventh pillar of mental and physical health, contiguous with gut health. He explains the demineralization/remineralization seesaw, how saliva pH governs cavity formation, and how the bacteria streptococcus mutans (not sugar itself) creates the acid that erodes teeth. He delivers daily protocols drawn from consultations with five dentists, covering brushing, flossing, xylitol, toothpaste, fluoride tradeoffs, and the dangers of alcohol-based mouthwashes. He emphasizes nighttime brushing and flossing as most critical because saliva production drops during sleep. He ties oral health to cardiovascular, metabolic, gut, and brain health, including a possible link between gum bacteria and Alzheimer's.
Big reveals
- Cavities can actually be reversed: teeth in a remineralization state can fill back in cavities that haven't yet reached the dentin layer.
- No food, not even sugar, directly causes cavities; bacteria that feed on sugar and produce acid cause them.
- Streptococcus mutans is not something you're born with, it is a communicable bacteria transmitted via kissing and sharing glasses or bottles.
- If you only clean your teeth once per 24 hours, nighttime is the most critical time because saliva production drops dramatically during sleep.
- Xylitol gets eaten by strep mutans but prevents it from producing acid and actually kills the bacteria, making it a potent oral-health tool.
- Most mouthwashes, especially alcohol-based ones, are terrible for oral health and deplete nitric oxide production.
- Gum bacteria that cause recession can cross the blood-brain barrier and potentially contribute to the plaques and tangles seen in Alzheimer's.
- Huberman formally adds oral and gut health as a seventh pillar alongside sleep, nutrition, movement, stress, relationships, and light.
Things worth remembering
- Tooth enamel is not white but translucent; light passes through it though it is somewhat opaque.
- The oral cavity heals cuts and burns with nearly zero scarring despite being a warm, moist, bacteria-filled open environment.
- The naturally occurring mineral responsible for most enamel bonds is hydroxyapatite, which fluoride can partially replace to make super-strong bonds.
- The threshold where alcohol harms oral health appears to be about two alcohol-based drinks per week.
- Stimulants harm oral health two ways: making saliva more acidic and encouraging mouth breathing that dries the mouth.
- Every dentist Huberman consulted recommended a soft toothbrush; medium or hard bristles disrupt the gum-tooth interface.
- Baking soda rates low on the abrasiveness scale and is considered safe enamel-friendly toothpaste alternative with a soft brush.
- Dentists suggested lightly brushing the tongue with a separate toothbrush rather than using a steel tongue scraper.
- Old fillings may contain lead or mercury; chewing hard candy or mastic gum can liberate mercury into the bloodstream.
- Alcohol-based mouthwashes reduce nitric oxide, which is important for vasodilation in the mouth, throat, nose, brain, and heart.