Peter Attia MD166 - Oral health, best hygiene practices, & relationship between oral health and systemic disease
CHAPTERS
- 0:02 – 4:00
Introduction and Dr. Corby's Path from Brazil to Dental Research
Peter Attia welcomes Dr. Patricia Corby, a periodontist and researcher, and asks about her background. She describes training in Brazil, specializing in periodontics and implant dentistry, and moving to the US for research. A brief tangent about Ayrton Senna follows.
- •Corby trained in periodontics and implant dentistry in Brazil
- •She stayed in the US because of research opportunities
- •Attia calls oral health an underappreciated part of overall health
- •Short personal tangent about Ayrton Senna's death in 1994
- 4:00 – 13:15
Tooth Anatomy and Why the Pulp Is So Innervated
Attia explains his own history of dental problems and asks for an overview of tooth anatomy. Corby covers enamel, dentin, pulp and the periodontium, and the two discuss why the pulp is so heavily innervated and vascularized.
- •Enamel is the hardest surface in the body; dentin underneath is cushion-like and sensitive
- •The pulp holds the nerves and blood supply
- •Corby speculates the innervation may be tied to immune response and early warning of infection
- •Implants never match natural teeth and can still get periodontitis
- 13:15 – 17:19
Types of Teeth and Their Functions
Corby walks through incisors, canines, premolars and molars and what each does, including the digestive role of chewing. They discuss why teeth have different numbers of roots and the importance of balanced occlusion.
- •Incisors cut, canines tear, premolars and molars break down food
- •Chewing with saliva starts digestion
- •Molars have more roots to withstand greater pressure
- •Poor occlusion can cause facial pain and headaches
- 17:19 – 22:55
The Healthy Mouth: Saliva and the Oral Microbiome
Attia asks what a healthy mouth looks like. Corby describes the role of saliva, the more than 700 bacterial species in the mouth, and how dysbiosis rather than a single pathogen drives disease.
- •Saliva constantly flushes the mouth and maintains microbiome balance
- •Oral bacteria are a mix of aerobic, anaerobic and facultative species
- •Disease comes from shifts in abundance and diversity, not outside invaders
- •Oral hygiene is the primary basis of oral health
- 22:55 – 33:05
The Twin Flossing Study and How Periodontal Disease Develops
Corby explains her study using twins to test the effect of stopping flossing. Periodontal pathogens became abundant within two weeks. She then describes how gingivitis progresses to pockets and bone loss, and its relationship to root and coronal caries.
- •Twins make a controlled model because they share genes and household
- •Within two weeks without flossing, adolescents had gingival bleeding and abundant periodontal bacteria
- •Gingivitis is reversible, but chronic disease leads to pockets, recession and bone loss
- •Exposed roots can develop root caries
- 33:05 – 40:42
Sugar, Biofilm, and Oral Care Before Modern Hygiene
The conversation turns to how sugar drives caries and how people managed before toothbrushes. Corby explains that cariogenic bacteria metabolize sugar and produce acid in a biofilm. She notes that plaque re-forms within hours and diets were different in the past.
- •Cariogenic bacteria attach as biofilm, metabolize sugar and secrete enamel-eroding acid
- •Early childhood caries is linked to bottles and formula; Corby says breast milk causes less decay
- •Mechanical disruption of biofilm is the goal of brushing
- •Modern sugar-heavy diets make things worse than in the past
- 40:42 – 50:34
Brushing, Flossing, and Personalizing Oral Hygiene
Attia asks whether toothpaste matters more than the brush, why flossing helps, and whether to floss before brushing. Corby argues for fluoride toothpaste, brushing the tongue, and tailoring oral care to the individual.
- •Toothpaste is the main source of fluoride, so it matters as much as the brush
- •Corby recommends brush, floss, then rinse or brush again, plus tongue brushing
- •Different mouth surfaces harbor different bacteria
- •Oral care should be personalized to age, risk and conditions
- 50:34 – 1:00:48
Oral Care for Head and Neck Cancer Patients Undergoing Radiation
Corby describes how she began cleaning the mouths of radiation patients at NYU and how that led to a pilot and a larger trial. She explains why oral care isn't standard or insured for these patients and how the trial is designed.
- •Radiation causes dry mouth, ulcers and a shifted microbiome, leading to fungal infection
- •Patients she treated did not develop mucositis, which prompted the pilot
- •Her pilot showed suppressed salivary cytokines in treated patients
- •Her trial compares a comprehensive periodontist-led cleaning with a lighter hygienist visit
- •Oral health care is not part of standard oncology care or insurance coverage
- 1:00:48 – 1:02:47
HPV and Oropharyngeal Cancer
Attia asks about the HPV status of Corby's trial patients and the rise of HPV-driven oropharyngeal cancers. Corby says most are HPV positive, ties transmission to oral sex, and mentions that poor oral health and certain bacteria may help viruses grow.
- •Most patients in her trial are HPV positive with oropharyngeal cancer
- •Attia notes there are no good screening methods for these cancers
- •Corby says transmission is sexual, including oral sex
- •Certain bacteria and weak immunity may allow viruses to flourish
- 1:02:47 – 1:18:15
Stages of Caries, Root Canals, and Their Safety
Attia asks for the stages of caries from enamel to root canal, and Corby explains pain patterns and treatment options. Attia shares his own root canal experiences, and they discuss modern microscopic endodontics and reject claims that root canals cause systemic disease.
- •Enamel-level lesions can sometimes be reversed with fluoride
- •Pain starts at the dentin; hot sensitivity suggests more inflammation
- •Once the pulp is hit, a root canal is needed
- •Modern root canals are done under a microscope in an aseptic field
- •Corby calls claims linking root canals to cancer and other diseases nonsense with no evidence
- 1:18:15 – 1:25:51
Oral Health and Systemic Disease
Attia asks which systemic diseases are most tied to poor oral health. Corby says the evidence is associative, citing diabetes, birth weight, heart disease and Alzheimer's markers, and that only clinical trials can show causality. They discuss Down syndrome and inflammation as a plausible mechanism.
- •Associations exist with diabetes, low birth weight, heart disease and Alzheimer's markers
- •Causality requires trials in which oral care is improved
- •Children with Down syndrome have poor oral health and amyloid findings in one study
- •Attia suggests chronic inflammation as the simplest explanatory mechanism
- •Corby is helping start a center for people with disabilities focused on prevention
- 1:25:51 – 1:31:05
Oral Health, COVID-19, and Dental Care During the Pandemic
Corby argues that the mouth is overlooked in COVID care, noting ACE2 receptors in the oral cavity and the lack of oral hygiene for hospitalized patients. She also explains why dental problems may have risen during the pandemic.
- •Corby says doctors rarely ask patients about their mouth
- •ACE2 receptors are highly expressed in the oral cavity
- •Corby says hospitalized COVID patients typically get no oral care despite risk of lung infection
- •Dental clinics closed and aerosol procedures were suspended
- •Corby attributes increased decay to a combination of factors, not masks themselves
- 1:31:05 – 1:37:06
Dry Mouth, Oral Thrush, Xylitol, and Gum
Attia asks how people with normal immunity can get thrush. Corby cites dry mouth, medications and poor hygiene, then discusses sugar-free gum, hydration and xylitol, including her research on mother-to-child bacterial transmission.
- •Lack of saliva is a primary cause of oral candida infection
- •Doctors should ask patients about dry mouth and medications
- •Sugar-free gum and sipping water help; avoid sugar
- •Corby likes xylitol; her study had mothers chew it during gestation to prevent strep mutans transmission
- 1:37:06 – 1:43:02
Tooth Color, Whitening, and Mercury Fillings
Attia asks whether tooth color is genetic and whether whitening is safe. Corby says color is largely environmental, whitening is best done at the dentist, and working mercury fillings should generally be left alone.
- •Tooth color has some genetic basis but is highly environmental; tea and coffee stain
- •Overuse of whitening products can demineralize teeth and harm gums
- •Corby recommends whitening at the dentist
- •Corby says there is no proven harm from mercury fillings and working ones should stay
- 1:43:02 – 1:50:38
Fluoride, Varnish, and Children's Dental Care
Corby explains that toothpaste should contain adequate fluoride and discusses water fluoridation and varnish. They cover bedtime brushing, baby bottle decay, and how decay in young children is treated.
- •Look for toothpaste with 1,000–1,500 ppm fluoride, such as ADA-endorsed ones
- •Fluoride varnish can prevent decay in children and adults
- •Night brushing is most important because saliva drops during sleep
- •Severe early childhood decay is treated under sedation, sometimes with a darkening fluoride-metal agent
- 1:50:38 – 1:59:44
Dental Tools: Tongue Cleaning, Floss, Waterpik, Toothpicks, Electric Brushes
Attia asks about oil pulling, tongue scrapers, floss types, Waterpiks, toothpicks and electric toothbrushes. Corby finds no evidence on oil pulling, prefers brushing the tongue, says floss type matters little, and considers flossing more important than brushing.
- •No evidence for oil pulling; Corby prefers brushing the tongue to scraping
- •Any floss works if you will use it; most people don't floss daily
- •Corby argues flossing is even more important than brushing for gingivitis
- •Waterpik and toothpicks are fine but not substitutes for floss
- •Oral-B and sonic electric brushes are both effective
- 1:59:44 – 2:14:01
Building an Ideal Oral Care Regimen
Attia describes his own routine and Corby suggests changes, including a morning brush, a soft tongue brush, and cleaning toothbrushes. They discuss mouthwash, dental visit frequency, and why periodontal disease progresses differently across people.
- •Corby recommends brushing three times a day, including after waking
- •Rinse and dry toothbrushes; use a soft brush for the tongue
- •Corby dislikes routine mouthwash because it wipes out good bacteria
- •Six-month cleanings are a minimum; higher-risk people may need more
- •Periodontal progression varies and is influenced by systemic health
