How to Improve Oral Health & Its Critical Role in Brain & Body Health

Summary

Andrew Huberman provides a deep dive into oral health, explaining how the mouth serves as a gateway to whole-body health -- with poor oral hygiene linked to increased risk of cardiovascular disease, dementia, metabolic disorders, and gut dysbiosis. He covers the biology of teeth (enamel, dentin, the living pulp), how cavities form through bacterial acid production, and the process of remineralization by which teeth can actually repair early-stage decay. Saliva plays a central role as a natural defense, containing antimicrobial compounds and minerals that continuously rebuild tooth surfaces, which is why mouth breathing and frequent snacking (which keep the mouth acidic) are particularly damaging.

The episode provides a comprehensive oral care protocol: brush teeth at night before bed (the most important brushing), avoid brushing within 60 minutes of eating acidic foods, floss or use a Waterpik daily, use xylitol (which actively inhibits cavity-causing bacteria), and choose toothpastes containing either hydroxyapatite or low-dose fluoride. Huberman advises against alcohol-based mouthwashes, which disrupt the oral microbiome and reduce beneficial nitric oxide production. He also covers tongue brushing, baking soda rinses, salt water rinses for gum health, the importance of nasal breathing for the oral microbiome, and the connection between gut health and canker sore prevention.

Key Points

Poor oral health is directly linked to increased risk of cardiovascular disease, Alzheimer's, metabolic disorders, and gut dysbiosis
Teeth can remineralize and repair early-stage cavities when the mouth maintains a neutral-to-alkaline pH and adequate mineral supply from saliva
Nighttime tooth brushing is the single most important oral hygiene practice because saliva production drops dramatically during sleep
Xylitol actively inhibits Streptococcus mutans (the primary cavity-causing bacterium) and promotes remineralization
Alcohol-based mouthwashes disrupt the oral microbiome and reduce nitric oxide production, potentially raising blood pressure
Mouth breathing is one of the most damaging habits for oral health, drying saliva and shifting the microbiome toward pathogenic bacteria
Avoid brushing within 60 minutes of consuming acidic foods or drinks to prevent abrasion of temporarily softened enamel

Key Moments

Nasal Breathing

Mouth breathing at night wrecks oral health

Nasal breathing at night is critical because mouth dryness allows harmful bacteria to thrive, leading to cavities and gum disease.

"There's also an ocular microbiome. There's a bunch of things there, but think about just this gaping hole in the front of our face that we use to eat and speak and breathe, okay? It's a huge hole. And as a consequence, it's filled with bacteria from our outside environment all day long all day long sometimes at night although we're going to talk later about the critical critical need to be a nasal breather at night and not a mouth breather not just for sake of staving off sleep apnea but also because turns out the dryness of the mouth is one of the ways that you really can throw off your oral health in major ways in fact it's one of the ways that you really can throw off your oral health in major ways. In fact, it's one of the leading causes of tooth decay in people like methamphetamine addicts, or if you see people that are mouth breathers, their oral health and their teeth generally, but certainly their oral health is severely depleted. So you've got this big hole in front of your face and you're talking and eating and moving about during the day, even if you're a nasal breather, when you're not talking or eating, and all this bacteria is getting in, and it's a really moist environment and it's really warm. So the combination of bacteria moist and warm means that this thing is like a Petri dish for growing stuff that could potentially be really bad for us, but it has this incredible feature, which is that if the pH is right, then the bad stuff is killed off. Doesn't make it into our system, doesn't disrupt our oral health or our bodily health. It also has a critical feature, which is that the bacteria that are good for us proliferate and supports the sealing process of the gums against the teeth and tooth health and tongue health and palate health, et cetera. Okay, so the oral cavity is amazing by virtue of how vulnerable it is, but also how robust it is. And the way it stays robust is by keeping the saliva healthy. Now, there are other ways too, but that's one of the main ones. And it's a huge portal into the rest of the body. And if the oral cavity isn't amazing to you already, based on what you've heard thus far, think about this. If you get a cut on your arm or your hand or your shin, unless you're one of these remarkable people that always heals up without a scar, as long as you're about 25 years or older, typically you'll form a little bit scar. There'll be something noticeable there. The oral cavity also can take cuts and burns and things like that. Unfortunately, those things occur. But with rare exception, heals up with nearly zero scarring. Sometimes there's a scar, but nearly zero scarring, which is remarkable. Why? Well, it's basically an open wound with a bunch of bacteria and it's warm and it's moist. So clearly there's something special going on in this thing that we call the oral cavity. Indeed, there is. And it's anchored in the fact that if we treat it right, you can encourage remineralization. How do you do that? By keeping the saliva healthy. How do you do that? By supporting the proper bacteria within the mouth and making sure that you're eliminating the bacteria that you don't want, or at least limiting those bacteria. And today we're going to talk about how to do that. And by virtue of doing all the things that support tooth health, you're also going to support gum health. Okay, those gums are critical because they form that barrier that if it gets too big, if those pockets, those recesses get too big, and you're not taking care of the bacteria in your mouth, meaning you're not getting rid of the bad bacteria, those bacteria worm their way down into the deeper recesses near the roots of the tooth, sometimes into the tooth, we'll talk about that, and can get down into the bone and then can cause serious, serious issues. This is so-called periodontal disease. And periodontal disease is associated with all sorts of really bad stuff, including Alzheimer's. Okay, this is not just some wellness culture, woo science leap to Alzheimer's. There's literally evidence that the specific bacterias that cause recession of the gums can cross the blood brain barrier if they make it into the general circulation and potentially cause plaques and tangles, some of the hallmark features of neural degeneration in Alzheimer's, okay? Probably not the only cause of Alzheimer's, but potentially one of the major causes. This is a new theory, but it's one that a lot of people are starting to pay attention to. And it's also very clear that bacteria make it down into these deeper recesses near the roots and into the bone that you can end up with issues related to cardiac health and certainly metabolic health. Okay, so again, the goal today is not to scare you. It's not to spend too much time on all the terrible things that can happen, but rather to emphasize the positive, which is that if you do the right things at the right times, especially if you do them on a regular basis, that you can really improve the health of your total oral cavity and your teeth and your breath and all the other stuff that people care about for aesthetics and interpersonal interactions will flourish as well. I'd like to take a brief moment and thank one of our sponsors, and that's AG1. AG1 is a vitamin mineral probiotic drink that also contains adaptogens. I started taking AG1 way back in 2012. The reason I started taking it and the reason I still take it every day is that it ensures that I meet all of my quotas for vitamins and minerals, and it ensures that I get enough prebiotic and probiotic to support gut health. Now, gut health is something that over the last 10 years, we realized is not just important for the health of our gut, but also for our immune system and for the production of neurotransmitters and neuromodulators, things like dopamine and serotonin. In other words, gut health is critical for proper brain functioning. Now, of course, I strive to consume healthy whole foods for the majority of my nutritional intake every single day, but there are a number of things in AG1, including specific micronutrients that are hard to get from whole foods, or at least in sufficient quantities."

Nasal Breathing

Stimulants acidify saliva and promote mouth breathing

Stimulants make the mouth more acidic, enabling cavity-causing bacteria, and shift the autonomic nervous system toward mouth breathing.