Dr. Ellie Phillips · 2026-02-02 · Ellie Phillips (host)
“Everything I knew about dentistry - you turned it on its head” - Dr. Ellie with Ask A Hygienist
32 research-tied claims examined: 4 contradicted 3 overstated 3 context 11 supported 11 unverified
4 Contradicted by research
In Denmark, the average person has a quarter of a cavity per person for life.
"In Denmark the average person has a quarter of a cavity per person for life." (said at 0:00:30)
Epidemiological monitoring of oral health in Denmark contradicts the claim that the average person has only 0.25 (a quarter) of a cavity over a lifetime. While Denmark has achieved substantial reductions in dental caries through national prevention programs, standard oral health metrics—such as the Decayed, Missing, and Filled Teeth (DMFT) index—show that 12-year-old Danish children currently average approximately 0.5 DMFT, and 6-year-olds average approximately 1.0 decayed, missing, or filled primary tooth (dmft). Because caries experience is cumulative over a lifespan, adult lifetime caries rates in Denmark are significantly higher than 0.25 cavities per person.
Estrogen increases the body's inflammatory response during pregnancy.
"I mean estrogen increases your inflammatory response. That's how it allows growth and baby growth, and it changes how our body—that's why we are more at risk for some things to happen during pregnancy." (said at 0:23:30)
The speaker claims that estrogen increases the inflammatory response during pregnancy to enable fetal growth and that this heightened inflammation increases vulnerability to complications. In reality, published immunological and endocrinological evidence demonstrates the opposite: high physiological concentrations of estrogen during pregnancy exert predominantly anti-inflammatory and immunomodulatory effects. Estrogen promotes immune tolerance at the maternal-fetal interface by inducing anti-inflammatory M2 macrophage polarization, shifting immune responses toward a T helper 2 (Th2) phenotype, and downregulating pro-inflammatory cytokine cascades to prevent fetal rejection. While estrogen at low, non-pregnant basal levels can stimulate certain humoral immune pathways, the high levels characteristic of pregnancy suppress innate inflammatory responses rather than amplifying them.
Xylitol is the only five-carbon sugar alcohol and prevents dental plaque bacteria from synthesizing the sticky matrix required to adhere to teeth.
"It makes plaque bacteria slippery. It doesn't kill them. It actually simply feeds them, but they can't process it because it is a different shaped molecule from sugar and from every other sugar alcohol. It's the only one that's a five-carbon sugar. And it just doesn't fit their mechanics. And that's why plaque cannot make the sticky stuff that sticks it to teeth." (said at 0:35:45)
The host's statement contains multiple factual inaccuracies regarding the chemistry and biological mechanism of xylitol:
1. **Chemical structure**: The claim states that xylitol "is the only five-carbon sugar alcohol" and that it is "a different shaped molecule from sugar and from every other sugar alcohol. It's the only one that's a five-carbon sugar." In reality, there are multiple five-carbon sugar alcohols (pentitols), including arabitol (D-arabitol, L-arabitol) and ribitol (adnicol), as demonstrated in biochemical literature evaluating pentitol metabolism in mammalian and microbial systems (e.g., PMID 15234337).
2. **Mechanism on bacteria**: The claim asserts that xylitol "doesn't kill them. It actually simply feeds them... And that's why plaque cannot make the sticky stuff that sticks it to teeth." In cariogenic bacteria such as *Streptococcus mutans*, xylitol is taken up via the phosphoenolpyruvate:carbohydrate phosphotransferase system (PTS) and phosphorylated to xylitol-5-phosphate. Bacteria cannot metabolize xylitol-5-phosphate for energy; instead, it accumulates inside the cell and inhibits key glycolytic enzymes, creating a toxic "futile cycle" that expends energy (ATP) to export it. This inhibits bacterial growth and acid production (a bactericidal/bacteriostatic futile cycle), rather than acting as a simple non-toxic feed or substrate.
European safety regulators withheld approval of nanohydroxyapatite for approximately 12 years due to concerns regarding calcification buildup in arteries.
"And the European Safety Commission, I mean, I don't know who they're made up of, but they were adamant for about 12 years that they would not approve this because they were nervous about the buildup of calcifications in the arteries." (said at 0:45:24)
European regulators (specifically the Scientific Committee on Consumer Safety, SCCS) did express safety concerns regarding nano-hydroxyapatite in oral care products, but their concerns were based on potential cellular uptake, particle shape toxicity (specifically needle-shaped nanoparticles), and a lack of adequate toxicological safety data submitted by manufacturers—not concerns over calcification buildup in the arteries. Official evaluations concluded that needle-shaped nano-hydroxyapatite posed potential cellular toxicity concerns, while evidence for other particle shapes was initially insufficient for safety clearance.
Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.