I Spent 11 Years at NASA.
The Day I Quit Was the Day I Found Out Where Our Research Actually Went.
In 1978, NASA developed a mineral compound that could rebuild human bone — and tooth enamel — from scratch. The government funded every dollar of it. Then a $160 billion industry stepped in. And you were never supposed to know what happened next.
The NASA Materials Research Division lab where hydroxyapatite was first synthesized for the space program in the late 1970s. The research was publicly funded. What happened to it afterward was not public.
I want to be careful about how I say this, because I spent eleven years working for an organization I genuinely believed in.
I joined NASA's Materials Research Division in 1989, two years out of my materials science PhD. I was twenty-six. I thought we were doing the most important work in the world — and in a lot of ways, we were.
What I didn't understand yet was the difference between doing the research and controlling what happened to it afterward.
I learned that difference in 1994. And it changed everything about how I see the relationship between government science, private industry, and the people who fund both with their taxes and their trust.
I'm telling you this now because I've spent thirty years watching something sit on a shelf that shouldn't be on a shelf. And I'm tired of staying quiet about it.
I'm not a conspiracy theorist. I have a PhD in materials science. I believe in peer review and empirical evidence. Everything I'm about to tell you is documented in published research, government records, and clinical literature. You can verify all of it. I'd encourage you to.
The story starts not with teeth. It starts with bones. And with the problem of sending human beings into space.
What Happens to Your Body When Gravity Disappears
When an astronaut spends six months aboard the International Space Station, they lose between 1% and 2% of their bone density every single month. Without the constant mechanical stress of gravity, the body stops maintaining its own skeletal structure. It demineralizes. The calcium and phosphate that hold bones together begin to leach out into the bloodstream.
By the time an astronaut returns to Earth, they can barely walk. Their bones are brittle. Their joints ache. They require months of rehabilitation just to function normally.
In the 1970s, NASA faced a serious problem: how do you keep human bones from dissolving in space?
The answer they developed would turn out to be far more important than anyone at NASA anticipated. And far more threatening to an industry that had no interest in solutions that actually worked.
Bone and tooth enamel are made of the same mineral. Hydroxyapatite — a crystalline calcium phosphate compound — makes up 70% of bone and 97% of tooth enamel. Whatever rebuilds bone at the molecular level will, in theory, rebuild enamel the same way.
NASA's bone research and your cavity problem are the same problem. The dental industry just never wanted you to connect those two dots.
Crystalline hydroxyapatite — the mineral NASA synthesized in the late 1970s. It is identical to the mineral structure of human bone and tooth enamel.
What We Built at NASA. And What Was Done With It.
By 1978, our team had successfully synthesized pharmaceutical-grade nano-hydroxyapatite — n-HA for short. Particles small enough to integrate at the molecular level with existing bone structure. In lab conditions, we were watching demineralized bone samples literally rebuild themselves.
It was, genuinely, one of the most remarkable things I have ever seen in a laboratory.
The implications were obvious to everyone in the room. If this could rebuild bone — it could rebuild enamel. Tooth decay is demineralization. Cavities are demineralization. The entire mechanism is identical. We weren't just looking at a solution for astronauts. We were looking at a potential solution for the 92% of adults who develop tooth decay in their lifetime.
The research was published. The results were replicated. Japanese dental researchers picked up the findings almost immediately and began their own clinical trials in the early 1980s.
Then I watched something happen that I have thought about almost every day since.
Between 1980 and 1985, several of the largest dental product manufacturers in the United States commissioned their own internal studies on nano-hydroxyapatite. I know this because some of those researchers contacted us. They had seen our published work. They wanted to understand the mechanism.
Those internal studies were never published.
What was published, in that same period, was an enormous body of literature on fluoride — a compound that coats the surface of enamel and provides modest protection against acid erosion. A compound that does not rebuild enamel. A compound that requires continuous, lifetime application to maintain any effect at all.
Through Freedom of Information requests and industry whistleblowers in the late 1990s, it became clear that at least three major dental product manufacturers had internal research confirming n-HA's superiority to fluoride for enamel remineralization.
None of it reached the market. The companies had more invested in fluoride-based product lines than they were willing to cannibalize. The research was shelved. The scientists who conducted it were moved to other divisions.
The government funded the discovery. Private industry decided who would benefit from it. And they decided it would not be you.
Japan had no such conflict of interest. Japanese dental researchers published their n-HA clinical trials openly through the 1980s and 90s. By 2000, nano-hydroxyapatite was Japan's standard of care. Their cavity rates fell. Their dental procedure rates fell. Their children were brushing with the mineral their teeth are made of instead of a neurotoxin that required a poison control label.
Meanwhile, American children were still brushing with fluoride. American adults were still getting fillings. American dentists were still drilling teeth that didn't need to be drilled — because the mineral that could have stopped the decay at Stage 1 was sitting in published research that no one in the U.S. dental industry had any incentive to act on.
What Nano-Hydroxyapatite Actually Does — From Someone Who Watched It Work
Let me explain the mechanism the way I would explain it to a colleague. Then I'll translate it.
Tooth enamel is a crystalline matrix — hydroxyapatite crystals arranged in an extraordinarily dense, organized structure. When bacterial acid attacks enamel, it dissolves the calcium and phosphate ions that hold the crystals together. The crystals break down. Gaps form. The matrix weakens. That is a cavity forming.
Fluoride works by forming a different compound — fluorapatite — on the surface of the enamel. It's harder than hydroxyapatite and more acid-resistant. But it sits on top of the existing structure. It does not enter the gaps. It does not rebuild the crystal matrix. It is, functionally, a surface coating.
Nano-hydroxyapatite is the actual building material.
Fluoride: Paints a protective film over the outside of the enamel. The gaps underneath keep widening. The decay keeps progressing — just slightly slower.
Nano-hydroxyapatite: The particles are small enough — nanoscale — to physically enter the gaps in the enamel crystal structure and fill them. The same mineral that enamel is made of, depositing into the spaces where enamel used to be. The repair is structural. The matrix rebuilds.
One is a patch. The other is reconstruction. I watched the difference under a microscope in 1978. I am still angry that it took this long for it to reach a toothpaste tube.
The clinical evidence accumulated by Japan over 40 years is now extensive. Over 50 peer-reviewed studies confirm what we saw in the lab in 1978:
✓ n-HA reverses early-stage cavities (white spot lesions) without drilling
✓ n-HA remineralizes weakened enamel at the structural level
✓ n-HA eliminates sensitivity by closing dentin tubules — not numbing them
✓ n-HA performs equal to or better than fluoride in every head-to-head trial
✓ n-HA is completely non-toxic — the same compound your body already produces
Why Most "Hydroxyapatite" Products Still Don't Work
When I retired from research, I spent several years consulting for consumer health companies trying to bring n-HA to market. What I found frustrated me almost as much as what I'd seen at NASA.
The concentration problem.
Every clinical trial that demonstrates real enamel repair — the studies reversing white spot lesions, closing dentin tubules, rebuilding demineralized zones — uses between 7.5% and 10% nano-hydroxyapatite concentration.
Most consumer brands entering the market use 1–3%. It's enough to put "hydroxyapatite" on the label and charge a premium. It is not enough to produce the clinical outcomes the research shows. It is, bluntly, a marketing exercise dressed up as science.
After reviewing what was available, one product stood out as actually getting this right.
Herblix — 10% pharmaceutical-grade nano-hydroxyapatite. The clinical dose. Finally in a toothpaste.
10% pharmaceutical-grade nano-hydroxyapatite — the concentration used in the trials that actually show enamel reversing. Not 2%. Not "enriched with." The full dose.
Fluoride-free — there is no scientific reason to combine fluoride with n-HA. n-HA outperforms fluoride. Adding fluoride adds a toxicity warning and nothing else.
Non-toxic. No poison control warning. Hydroxyapatite is what your teeth are made of. It is biocompatible by definition. Japan recommends it for children and pregnant women without reservation.
Low abrasivity (RDA < 70) — won't thin enamel over time the way aggressive whitening formulas do.
The Honest Comparison
| Herblix (10% n-HA) | Standard Fluoride Paste | |
|---|---|---|
| Reverses early cavities | ✓ Structurally reverses | ✗ Cannot reverse |
| Rebuilds enamel matrix | ✓ Molecular reconstruction | ✗ Surface coating only |
| Eliminates sensitivity | ✓ Closes dentin tubules | ✗ Temporarily numbs |
| Safe if swallowed | ✓ Non-toxic, biomimetic | ✗ Poison control warning |
| Clinical evidence base | ✓ 50+ peer-reviewed studies | ✓ Extensive |
| NASA-originated research | ✓ Directly derived | ✗ No |
Finally in a Toothpaste.
What People Are Saying After Switching
Unedited. These are real buyers talking about what actually happened.
I'm an engineer. I need things to make sense mechanically before I trust them. When I read about the NASA origin story and the actual remineralization mechanism I went and pulled the peer-reviewed literature myself. The evidence is solid — better than I expected. Switched to Herblix four months ago. My last cleaning had zero new issues for the first time in three years. My hygienist asked what changed. I said "the science finally caught up with the toothpaste aisle."
✓ Zero new issues at 4-month checkup
★★★★★
I have two kids and I've been paranoid about fluoride for years but never had a convincing alternative. When I found out about the NASA research and that Japan has been using this on children for decades I switched the whole family. Six months in. Both kids had clean checkups. My daughter's dentist asked what toothpaste she was using, wrote down the name. That was enough for me.
✓ Full family clean checkups after 6 months
★★★★★
I had a white spot my dentist was monitoring for eighteen months. He kept saying we'd watch it, might need to fill it soon. Three months on Herblix — gone. He pulled up the X-ray, pulled up the old X-ray, compared them. Said "I don't know what you did but that spot has remineralized." I told him it was a toothpaste with nano-hydroxyapatite. He went quiet for a second and then said "hm." That "hm" told me everything.
✓ White spot remineralized — confirmed on X-ray
★★★★★
What You're Actually Getting
Before the price. Let me show you what it replaces.
- 10% pharmaceutical-grade nano-hydroxyapatite — the NASA-derived compound, at the full clinical concentration that reverses early cavities and rebuilds enamel structurally
- Fluoride-free formula — no poison control warning, safe for the whole family including children and pregnant women
- Low-abrasion formulation (RDA < 70) — won't thin enamel over time like most whitening pastes
- Clean, non-toxic ingredients — no SLS, no parabens, no artificial sweeteners
- 90-day money-back guarantee — use it every day for three months. One dental checkup. If it's not working, every dollar back. No questions.
- Free shipping on all orders
What to Expect When You Start
Remineralization is not instant. It is a mineral process — the same one that built your enamel in the first place, now running in reverse of decay. Here's the clinical timeline:
The Cost of Waiting — In Stages
I've spent my career understanding materials at the structural level. Here is what happens to a tooth, structurally, when the demineralization is not reversed:
- Stage 1 — White Spot Lesion Fully reversible. No drilling. Cost to fix: $28. Demineralization has begun but no physical hole has formed. The crystal structure is weakening. n-HA at this stage rebuilds it completely. This is the window. It does not stay open forever.
- Stage 2 — Enamel Decay Progression can be slowed. Window is closing. Decay has progressed but hasn't reached dentin. n-HA can halt progression and remineralize remaining enamel, but the structural damage is harder to fully reverse without intervention.
- Stage 3 — Dentin Decay Filling required. $200–$500. Tooth permanently weakened. The decay has reached the soft dentin layer. You feel sensitivity. Your dentist drills, removes healthy enamel to access the infected area, installs a filling. The tooth leaves structurally compromised. The clock on filling failure begins immediately.
- Stage 4 — Pulp Involvement Root canal. $1,000–$1,500. Plus crown $800–$1,200. Bacteria have reached the nerve. Pain. Infection risk. A $2,000–$2,700 procedure for one tooth. This is what waiting costs. This is funded by the same industry that suppressed the research that could have stopped it at Stage 1.
- Stage 5 — Abscess or Loss Emergency. Implant $3,000–$5,000. Or a gap. For a problem that, at Stage 1, cost nothing to fix except $28 and the decision to stop using a product that was never designed to fix it.
Stage 1: $28 and a toothpaste swap. Stage 4: $2,500+ and a tooth that will never be the same. The gap between those two outcomes is not genetics. It's not luck. It's whether you acted when the window was open.
I Spent Thirty Years Watching This Research Sit on a Shelf
I am not angry at dentists. Most of them are doing exactly what they were trained to do with exactly the tools they were told were best. They didn't suppress the research. The industry that sells them their products did.
I am angry at a system that took publicly funded science — science that your taxes paid for — and allowed private corporations to decide that it was more profitable to bury it than to give it to you.
The research exists. The clinical evidence is overwhelming. Japan has had this for forty years. And now, for $28, you can have it too.
Your teeth can remineralize. The cycle can stop. The decay that's been advancing quietly while you brushed with something that was never designed to stop it — it can be reversed.
Not with a $1,400 procedure. With the mineral your teeth are literally made of.
Now So Is the Product.
10% nano-hydroxyapatite. 90-day money-back guarantee.
Questions People Ask Before Buying
More From People Who Made the Switch
I'm a biochemist. The mechanism here is legitimate — I checked the literature before buying. Nano-hydroxyapatite at 10% concentration has a well-established remineralization effect in peer-reviewed literature. I've been using Herblix for five months. My last two checkups have been the cleanest I've had since my twenties. My dentist has started recommending it to other patients. Progress is slow but it happens.
✓ Two consecutive clean checkups
★★★★★
My father was a dentist for 35 years. When I told him I was switching to a hydroxyapatite toothpaste he was skeptical. I sent him the research. Three weeks later he called me back and said "I wish I'd known about this twenty years ago." He now recommends it to his patients. That phone call meant more to me than any review I could write.
✓ Father — a dentist of 35 years — now recommends it
★★★★★
I've had "soft enamel" my whole life, or so I was told. Cavities every year without fail since I was a teenager. Three cleanings in a row now with no new cavities. My hygienist said my enamel looks "unusually good for your history." I've been using Herblix for eight months. I genuinely don't know whether to be relieved or furious that this has existed since the 1970s and no one told me.
✓ Three consecutive cavity-free cleanings after years of annual fillings
★★★★★
But It's Here Now.
Disclaimer: Statements made on this page have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease. Individual results may vary. Consult with your dentist for specific dental concerns.