The ingredient powering Australia's most advanced 3-in-1 oral gel — and why particle size changes everything.
If you've spent any time researching fluoride-free oral care, you've probably come across the term nano-hydroxyapatite — the remineralising compound that scientists first developed for NASA and that's now making its way into toothpastes, gels, and oral serums worldwide.
But here's what most brands won't tell you: not all nano-hydroxyapatite is the same. Particle size, shape, and manufacturing grade matter enormously — and the difference between a premium nano hap and a generic one could be the difference between real enamel repair and a product that mostly sits on the surface.
At Smile Kit, we chose nanoXIM® by FLUIDINOVA — and we didn't choose it by accident.
What Is Nano-Hydroxyapatite, and Why Does It Matter?
Your tooth enamel is made up of approximately 97% hydroxyapatite — a naturally occurring calcium phosphate mineral. Every day, acids from food, drink, and bacteria demineralise tiny sections of that enamel. Your saliva remineralises them back. But when the balance tips — from dry mouth, high-acid diets, or frequent whitening — enamel weakens faster than it can rebuild.
Nano-hydroxyapatite (nano hap) was developed to help tip the balance back. Because its mineral composition mirrors your enamel so closely, it can bind to exposed tooth surfaces, deposit into microfissures, and help plug open dentinal tubules — the tiny channels that, when exposed, cause that sharp, achy sensation we know as tooth sensitivity.
The science behind nano hap has been building for decades. Peer-reviewed studies have shown it can support enamel remineralisation, help reduce sensitivity, and contribute to a healthier oral environment — without fluoride, without harsh abrasives, and without any of the concerns that come with swallowing synthetic chemicals.
The Problem With Generic Nano-Hydroxyapatite
Walk into any pharmacy today and you'll find products labelled "nano hydroxyapatite toothpaste." Many of them contain particles in the range of 200 nanometres (nm) or larger. That might sound impressively small — and compared to standard hydroxyapatite, it is — but at that size, particles struggle to do what nano hap is actually supposed to do: penetrate.
Dentinal tubules — the microscopic channels responsible for sensitivity — are typically between 1 and 4 micrometres in diameter at their opening. For a particle to meaningfully enter and occlude these channels, size is critical. Larger particles tend to aggregate on the surface, forming a temporary coating that may feel smooth at first but washes away more readily with saliva, food, and normal oral activity.
The same logic applies to enamel surface integration. Smaller, more refined particles have greater surface area contact, better affinity to the hydroxyapatite already in your enamel, and a higher chance of staying put.
200nm nano hap is a starting point. At Smile Kit, we use it in our Swift n-HA+F and Swift X formulas — trusted, effective, and well-researched. But for our most advanced gel, we needed something more.
That's why the Swift Renew & Repair 3-in-1 Gel is powered by FLUIDINOVA nanoXIM® at 100nm — half the particle size, and engineered to a pharmaceutical-grade standard most oral care brands never come close to.
Introducing nanoXIM® by FLUIDINOVA
FLUIDINOVA is a Portuguese biomaterials company founded out of research and innovation in advanced nano-materials. Their flagship product line — nanoXIM® — is a range of pharmaceutical and cosmetic-grade hydroxyapatite suspensions engineered to a standard that most consumer-grade suppliers simply don't reach.
What makes nanoXIM® stand apart:
100nm Particle Size — Half the Size, Twice the Access
nanoXIM® particles are engineered to 100 nanometres — half the particle size of the 200nm nano hap used in most consumer oral care products (including our own Swift n-HA+F and Swift X formulas). At 100nm, particles have far greater opportunity to integrate with the enamel surface, access dentinal tubules, and deposit into the microfissures where remineralisation matters most. Less aggregation. More meaningful contact. More effective results.
Rod-Shaped — Just Like Real Enamel
This detail is easy to overlook, but it's one of the most important. Human enamel isn't made of spherical crystals — it's made of rod-shaped crystallites, tightly packed and aligned. nanoXIM® particles share this rod-like morphology, making them structurally biomimetic. They're not just chemically similar to your enamel — they're architecturally similar. That means better adhesion, better layering, and a more natural fit when they bind to tooth surfaces.
Formulated for Real-World Oral Care
FLUIDINOVA's nanoXIM® is produced under rigorous manufacturing controls, with consistent particle distribution and suspension stability across batches. For a formulator, this consistency matters enormously — it means the 13% concentration in every pump of Swift gel is genuinely delivering what it promises, every single time.
Smile Kit × FLUIDINOVA: An Official Trademark Partnership
We're proud to share that Smile Kit holds an official trademark agreement with FLUIDINOVA, allowing us to name and feature nanoXIM® directly in our products and communications. This isn't a generic supply relationship — it's a recognised partnership that reflects our commitment to formulation transparency and ingredient integrity.
When you see FLUIDINOVA nanoXIM® listed on a Smile Kit product, you're seeing the real thing — not an unbranded substitute.
How nanoXIM® Works Inside Swift Renew & Repair 3-in-1 Gel
Our Swift Renew & Repair 3-in-1 Gel contains 13% FLUIDINOVA nanoXIM® — a meaningful, active concentration designed to deliver results rather than simply feature in an ingredient list.
Inside Swift, nanoXIM® works as part of a triple-active sensitivity system:
1. nanoXIM® (13%) — Rod-shaped nano-hydroxyapatite works from the outside in, helping to support tubule occlusion and enamel remineralisation with every use.
2. Potassium Nitrate (2%) — A clinically recognised desensitiser that helps calm the nerve signal at the root of sensitivity, working from the inside out.
3. 850nm Red Light Synergy — CoQ10, Riboflavin, and Astaxanthin are included to work in concert with 850nm red light therapy devices, supporting a deeper tissue response when you use Swift as part of your red light routine.
This three-way approach means you're not relying on a single mechanism to address sensitivity. You're layering complementary actions — mineral repair, nerve calming, and photobiomodulation support — into a single, easy-to-use gel.
Plus: Dry Mouth Relief and Live Probiotics
Swift's formula goes beyond sensitivity. A premium Dry Mouth Complex — featuring Betaine, Sodium Hyaluronate, Sodium PCA, and Lactoferrin — restores moisture to oral tissues and mimics the lubricating proteins naturally found in saliva. For anyone managing dry mouth (whether from medications, mouth breathing, or systemic conditions), this provides fast-acting, lasting hydration.
And three live probiotic strains — Lactobacillus ferment, Lactobacillus reuteri DSM 17938, and Lactobacillus paracasei — help maintain a healthy oral microbiome between uses, protecting the fresh nanoXIM® layer you've just applied.
How the Smile Kit Range Stacks Up by Nano Hap Grade
We believe in being upfront about every formula we make — including how they compare to each other.
| Product | Nano-HAP Source | Particle Size |
|---|---|---|
| Swift n-HA+F | Synthetic nano-hydroxyapatite | 200nm |
| Swift X | Synthetic nano-hydroxyapatite | 200nm |
| Swift Eggstra | Eggshell-derived nano-hydroxyapatite | 100nm |
| Swift 3-in-1 Gel | FLUIDINOVA nanoXIM® | 100nm |
Both Swift Eggstra and the Swift 3-in-1 Gel reach the 100nm mark — but nanoXIM® brings something eggshell-derived HAP can't: the rod-shaped biomimetic structure and pharmaceutical-grade manufacturing consistency of a specialist biomaterials company whose sole focus is nano-hydroxyapatite.
Why This Matters If You're Comparing Products
When you're evaluating oral care products that contain nano-hydroxyapatite, it's worth asking:
- What size are the particles? Generic nano hap at 200nm is widely available. Premium-grade nanoXIM® is engineered to 100nm — a meaningful difference in penetration potential.
- What shape are they? Spherical particles behave differently from rod-shaped ones. Rod-shaped nanoXIM® is biomimetic by design, mirroring the actual structure of tooth enamel.
- Is the concentration meaningful? A trace amount of nano hap in an ingredient list does very little. Swift contains 13% nanoXIM® — enough to make a functional difference.
- Who makes it? FLUIDINOVA is a specialist biomaterials company whose entire focus is nano-hydroxyapatite. This isn't a side product for them — it's their expertise.
- Is the brand transparent about their supplier? We name FLUIDINOVA and nanoXIM® directly because we believe you deserve to know what's in your oral care products — and why it was chosen.
100% Swallow-Safe. Fluoride-Free. SLS-Free.
Because nanoXIM® is biocompatible and chemically identical to the mineral already in your teeth, Swift is completely swallow-safe — no fluoride, no sodium lauryl sulphate, no harsh foaming agents. It's suitable for ages 6 and above, making it one of the few advanced oral care gels appropriate for the whole family.
It's cruelty-free, sugar-free, and designed in Australia — formulated for modern mouths that need more than a standard toothpaste can offer.
The Bottom Line
Nano-hydroxyapatite is genuinely one of the most exciting developments in modern oral care. But like any ingredient, it's only as good as the form it takes. FLUIDINOVA nanoXIM® represents the premium end of the spectrum — 100nm particles, a rod-shaped biomimetic structure, and manufacturing-grade consistency that most consumer products don't come close to.
That's the standard Smile Kit chose for Swift. And it's the standard we believe every enamel-repair product should be held to.
Ready to experience the difference?
Shop Swift Renew & Repair 3-in-1 Gel →
Swallow-safe. Fluoride-free. Powered by FLUIDINOVA nanoXIM®. Designed in Australia.
Disclaimer: Smile Kit products are designed to support oral health and comfort. They are not intended to diagnose, treat, cure, or prevent any disease. Results may vary. Always consult your dental professional if you have concerns about your oral health.
