Why would toothpaste have lead in it?

These aren't toothpastes. They're outdoor materials.

I want to be careful here, because the easy line is "the clay is the lead," and that's a bad oversimplification. The clay is not literally lead. The clay is mined dirt that contains lead, alongside cadmium, arsenic, and whatever else was in the deposit. The actual issue is bigger and more obvious once you say it plainly: the things being marketed as "mineral toothpaste" are not toothpaste ingredients. They're industrial and outdoor materials with a wellness wrapper.

Run through the list:

• Bentonite clay. Absorbent volcanic clay. Used in cat litter, drilling muds, pottery slip, foundry sand binders, and clarification of wine. Mined. Contains lead at the level of the deposit it came from. Earthpaste's published bentonite is 11.9 ppm Pb. That's outdoor material.
• Kaolin clay. The white clay used to coat glossy magazine paper and to make porcelain. Same story, different deposit. Mined.
• Hydroxyapatite (synthesized). Lab-made calcium phosphate. The pharmaceutical grade is reasonably clean. The marketing claim, that it "rebuilds enamel by replicating the mineral structure of the tooth", does not survive the dental literature. Enamel is a complex biomineral; you don't rebuild it by smearing on a powder.
• Hydroxyapatite ("natural" / n-Ha / biogenic). Often ground bone. Often ground oyster or seashell. Sometimes ground geological apatite. Variable contamination depending on the source. Every n-Ha-based paste in independent ICP-MS testing so far has come back positive for lead. Boka Ela Mint = 32 ppm. RiseWell Kids = 26 ppm.
• "Mineral salts," "earth minerals," "tooth powders." Same category. Mined or rendered, then ground, then sold with watercolor leaves on the label.

The whole "remineralize your teeth with mineral toothpaste" pitch is influencer copy adjacent to dentistry but not actually in it. Open any pediatric dentistry textbook and the section on remineralization is about saliva, fluoride, and dietary calcium. It is not about smearing dirt on baby teeth.

Every toothpaste I could find numbers on, ranked.

I pulled this from Lead Safe Mama's published lab reports (independent ICP-MS, community-funded), Earthpaste's own white paper, and FDA cosmetic surveys. Where I couldn't find a real number, I marked it. I'm not making numbers up.

ND = non-detect at the laboratory's reporting limit. Sources: Lead Safe Mama 2025 toothpaste comparative chart; LSM Earthpaste 2017 testing; LSM Lemon Twist 2025 lab report; LSM Boka 2025; LSM RiseWell Kids 2025. ICP-MS via independent third-party lab; XRF for solids.

The real question is whether they spit or swallow.

I've watched the fluoride debate get more religious every year. Most of it is downstream of confusion between two completely different doses: the dose that reaches a kid's bloodstream from a pea-sized blob they spit out, versus the dose from a tube they ate. These are not the same number, and the safety question hinges on which one you're actually talking about.

If they spit most of it out, typically age 3 and up with adult supervision, pea-sized amount, rinse and spit, fluoride toothpaste is the boring, effective answer. The dose that actually reaches their bloodstream is tiny. It is not going to harm their brains. The ADA and AAPD have been unambiguous on this for decades, the data continues to back it up, and the cavity-prevention benefit is large and well-replicated. Pea-sized for ages 3 and up. Smear (rice-grain) for under 3. That's it.

If they swallow most of it, toddlers under 3 reliably do, no matter what you tell them, pick a clean fluoride-free option from a real toothpaste brand. Tom's of Maine fluoride-free is fine if you trust their QA, or any Crest/Colgate/Aquafresh fluoride-free kids' line. The clean fluoride-free options I have documented at non-detect for lead are Orajel Kids Training (Berry), Kid's Spry, Weleda Salt. Avoid the clay/bentonite/"mineral" stuff entirely. The fluoride-free shelf in a wellness store is exactly where the lead lives, that's the trade you'd be making, and it's a bad trade.

It's not toothpaste. It's the drinks.

Pediatric cavity rates and enamel erosion are downstream of acidic drinks far more than they're downstream of which paste you bought. Acid demineralizes enamel directly, even if your kid rinses afterward, the acid has already done damage to the surface.

Examples of the drinks doing the actual damage:

• Soda. Cola is around pH 2.5. Citrus sodas are around pH 3. That's a straight-up acid bath for enamel, plus sugar for the bacteria.
• Sports drinks. Gatorade, Powerade, Prime, Bodyarmor, acidic and sugary. Marketed as healthy for kids; aren't.
• Energy drinks. Acidic, sugary, and stimulants on top. None of this is for a developing kid.
• Sweetened juices. Orange juice, apple juice, fruit punch, sugar and acid in the same glass. Daily glass of OJ at every meal is one of the most quietly damaging routines for baby teeth.
• Flavored sparkling water. Carbonic acid plus citric acid plus "natural flavors." Less aggressive than soda but still acidic, and the flavoring trains the palate the same way soda does.

Beyond the enamel: a kid has no baseline for what a drink is supposed to taste like. If they grow up on intense, sweet, high-flavor drinks, they don't develop a tolerance for water. They get hooked early on the kind of drinks that have real implications later in life, weight, metabolic health, dental erosion, the whole stack. Keep them off the super-acidic stuff. They shouldn't be drinking it anyway.

Plus their baby teeth literally fall out. Give them enough nutrition and their teeth and bones will be strong. That is the entire pediatric dental story, in a sentence.

The data trail, in plain English.

I'm not running my own mass spec on toothpaste, yet. The numbers above are pulled from three independent threads of public testing, and I want to be honest about what each one is and isn't.

Lead Safe Mama (Tamara Rubin) runs a community-funded testing initiative. She uses both XRF (a portable instrument that reads ppm-range surface composition non-destructively) and ICP-MS (the gold-standard digestion + mass-spec method that goes down to ppb) through accredited third-party labs. Her toothpaste-comparison chart was published January 2025 and has been updated through 2026. The lab reports are posted publicly. I cite her numbers as the data, not her opinions. Tamara is an advocate; I'm an engineer. We don't always agree on framing, but the lab work is solid.

Earthpaste's own white paper publishes 11.9 ppm Pb in their bentonite (Redmond Clay) base. That's not me speculating, and it's not Tamara accusing them, it's their published mineral analysis. The marketing they wrap around that number ("nature's mineral profile," "trace minerals are essential") is the part I take issue with. The number is theirs.

The FDA cosmetic surveys (2007, 2010) covered lipstick, not toothpaste, but the methodology is the same and the regulatory precedent matters: FDA's de facto cosmetic limit is 10 ppm Pb, and the Washington State Toxic-Free Cosmetic Act dropped it to 1 ppm effective January 2025. By either standard, the clay-based and HAp-based pastes above are non-compliant with cosmetic-grade ingredient standards, but toothpaste isn't regulated as a cosmetic in most cases, so the limits don't formally apply. That's the loophole.

If your favorite brand has an independent ICP-MS report posted with current numbers, send it to me at eric@fluorospect.com and I'll update this page. If the brand publishes only their own internal testing or only XRF screens of finished product (which can miss ppm lead in a high-organic matrix), I'll note it but I won't use it as primary evidence.

Why "mineral" toothpaste has lead and Crest doesn't.

This is the part nobody on the wellness side of the internet wants to talk about. Lead doesn't appear in toothpaste because someone added it. Lead is a trace metal that lives in the same geologic formations as the calcium-rich clays and apatite minerals being marketed as "natural" toothpaste actives. When you mine bentonite for its absorbent calcium-aluminum silicate, you also pull up lead, cadmium, arsenic, and mercury at whatever ratio the deposit happens to have. That's it. That's the whole story.

The conventional toothpaste industry fixed this in the 1950s by switching to synthetic abrasives, hydrated silica, dicalcium phosphate dihydrate, calcium carbonate that's precipitated out of pure feedstock. These ingredients are made in a chemical plant, not dug out of a hillside. That's why a 99-cent tube of CVS fluoride paste tests at non-detect for lead while the $14 jar with the watercolor leaves on it tests at 11+ ppm.

Hydroxyapatite is the new one. Marketed as "the mineral your tooth enamel is made of," which is technically true. The hydroxyapatite that goes into the nature-positioned brands is largely sourced from bone or biogenic apatite, ground bone, ground oyster shell, ground seashell, or geological apatite. Either way, it's mined or rendered. Either way, the testing data so far is consistent: every hydroxyapatite-based toothpaste Tamara Rubin has tested has come back positive for lead. That doesn't mean every brand on every batch will, but I'm not seeing a clean one yet, and the burden is on the brand to publish a real lab report.

Three moves. Five minutes in your bathroom and your fridge.

More in this series.

The Easy Wins series is about the 80/20 of lead safety, what to do in 15 minutes that moves the needle more than 15 hours of reading guides. Toothpaste is one of the highest-leverage swaps in the whole series: it's cheap, it takes one trip to the drugstore, and the dose math makes it more impactful than anything in your pantry.

→ Full Easy Wins index