Resources
The Library
Most of what gets written about oral care is either marketing or advocacy. These articles are neither. Each one explains a mechanism or reviews a body of evidence, cites its sources, and says plainly where the research is weak. Where we publish our own laboratory results, we publish the certificate itself rather than a summary of it.
25 articles
Fundamentals
7 articles
How teeth decay and repair themselves, and which everyday habits actually change the outcome.
- Fundamentals How cavities form A cavity is not an infection you catch. It is mineral loss that outpaced mineral repair, decided many times a day by acid, saliva and how often you eat. Read
- Fundamentals Saliva and oral health Saliva is supersaturated with the minerals teeth are made of, which is why enamel repairs itself between meals. How that works, and what happens when flow fails. Read
- Fundamentals How teeth whitening works Enamel is nearly transparent, so the color you see is mostly the dentin beneath it. What genuinely lightens a tooth, what only lifts surface stain, and which claims the evidence will not carry. Read
- Fundamentals Habits that protect teeth Rinse after eating, stop grazing, protect the night brush. The habits with real evidence behind them, and which ones rest on thinner ground. Read
- Fundamentals Powered toothbrushes Powered brushes modestly reduce plaque and gingivitis. What comparative trials show, and where timers may help. Read
- Fundamentals Does toothpaste need to foam? Foam changes the sensory experience, but the volume of lather is not a score for how clean your teeth are. Read
- Fundamentals What is oil-based toothpaste? How an oil-based carrier changes texture, ingredient compatibility and preservation without proving a clinical advantage. Read
Ingredients
7 articles
What each ingredient does in the mouth, what the trials found, and where the evidence thins out.
- Ingredients How fluoride works The mechanism, written straight by a company that does not use it. Topical rather than systemic action, the reservoir effect, and what the Cochrane reviews found. Read
- Ingredients Xylitol and oral health A noncariogenic sweetener that does not feed plaque acid production and is associated with lower levels of cavity-linked bacteria and plaque. Read
- Ingredients Sodium bicarbonate in oral care It buffers plaque acid, helps disrupt oral biofilm, has context-dependent antimicrobial effects, and lifts stain at unusually low abrasivity. Read
- Ingredients Surfactants and the oral mucosa Foam is made by molecules whose job is disrupting oil and water interfaces. Cell membranes are one. What that means, and why the mouth is not skin. Read
- Ingredients Preservatives and the oral mucosa Why water-based products need preservatives, what the tolerance evidence actually shows, and how removing the water changes the question. Read
- Ingredients Stannous fluoride and gum health Pooled trials found fewer bleeding sites with stannous fluoride. How tin contributes, and why some formulas can stain. Read
- Ingredients SLS-free vs. surfactant-free toothpaste SLS-free excludes one surfactant. Surfactant-free describes the broader formula. Here is how to tell the difference. Read
Reading the evidence
7 articles
Contested findings and label claims, assessed on what the studies actually measured.
- Evidence review Nano-hydroxyapatite: reading the trials The most studied fluoride alternative, assessed on its evidence. What the meta-analyses found, what non-inferiority does not prove, and who funded the research. Read
- Evidence review Fluoride in drinking water What the IQ research found and at what concentration, how US tap water compares, what fluorosis does to enamel, and how to look up your own supply. Read
- Evidence review Xylitol and cardiovascular risk Headlines link a sweetener to heart attacks. The studies measured blood xylitol rather than intake, and the body makes 5 to 15 grams of it a day. Read
- Evidence review Fluoridated water versus toothpaste Swallowed fluoride reaches teeth through saliva. What newer studies can and cannot show about its added benefit in the toothpaste era. Read
- Marketing claims Toothpaste abrasivity Whitening often means polishing away surface stain. Some formulas remove more tooth structure in laboratory tests. Why neither the label nor RDA alone can tell the whole story. Read
- Marketing claims “SLS-free” is not the same as gentle Removing SLS from a foaming toothpaste means adding another surfactant. Why skin mildness data does not transfer, and why origin says nothing about behavior. Read
- Marketing claims How much toothpaste to use A pea is 0.25 grams. In one survey, 96.8 percent of toothpaste advertisements showed four times that. The arithmetic, and who it actually matters for. Read
Choosing a toothpaste
4 articles
Decision frameworks for reading a label, and the laboratory results behind our own formula.
- Buying guide How to choose a natural toothpaste A neutral decision framework for fluoride, abrasivity, foam, preservation, testing and the claims on a natural toothpaste label. Read
- Buying guide How to choose a fluoride-free toothpaste A balanced decision guide that puts the evidence for fluoride beside personal cavity risk, formula quality and preference. Read
- Transparency Inside our seven-ingredient formula Every ingredient in Essential Mint, why it is in the formula, what has been tested and what the short list does not prove. Read
- Transparency Heavy metals testing Our lot 001 elemental panel reports measurable lead and the detection limits for arsenic, cadmium and mercury. Read the full certificate. Read
No articles match that search. Try a broader term such as fluoride, enamel, foam or testing.
These articles are educational. They describe published research and our own laboratory results. They are not medical or dental advice, not a diagnosis, and not a claim about any product. If you have a specific concern about your teeth or gums, ask a dentist.
Athena Naturals
Seven ingredients. Fluoride-free, no water, no preservatives, no surfactants. Made in small batches in Seattle.