Underbrush (by Nathan & Sons) is marketed as a natural, remineralizing chewing gum that strengthens enamel, fights bad bacteria, whitens teeth, and freshens breath, all using nano-hydroxyapatite and natural tree-sap gum bases. But is it the real deal or just hyped marketing?
In this review, I break down what Underbrush claims, what the formula contains, key warning signs, and whether it can actually help enamel health.
Key Takeaways
- Powered by nano-hydroxyapatite plus minerals and tree-sap bases; claims to remineralize enamel, reduce sensitivity, whiten teeth, and freshen breath.
- Ingredient profile is transparent and clean, using xylitol, erythritol, chicle, mastic, spruce, myrrh, acacia gum, calcium bentonite clay, and eggshell powder.
- Positive brand surveys and Reddit praise show enamel strength, reduced sensitivity, and fresher breath.
- Lots of knockoffs in the market, especially from third-party sellers; numerous complaints about counterfeit products from China that crumble and taste like candy.
- If purchased from the official site or a verified retailer, it appears effective and well-made, but sourcing matters a lot.
What Is Underbrush Remineralizing Gum?
This is a daily chewable gum meant to replace or supplement brushing and flossing. Users chew 1–2 pieces for 30 minutes after meals, leveraging nano-hydroxyapatite and mineral-rich saps to remineralize enamel and reduce sensitivity. The brand offers a 60-day money-back guarantee and ships in eco-friendly packaging.
How It Claims to Work
- Enamel Repair & Strength: Nano-hydroxyapatite, egg-shell powder, and clay deliver minerals directly to teeth.
- Bacterial Control & Clean Mouth Feel: Natural sap bases and xylitol/erythritol inhibit plaque bacteria and freshen breath.
- Sensitivity & Whitening: Filling tiny enamel crevices reduces sensitivity and polishes teeth gently.
According to the brand, most users notice smoother teeth and fresher breath within three weeks, with full benefits shortly after.
Ingredient Analysis
- Nano-hydroxyapatite: Well-supported, biomimics enamel, effective for remineralization at proper dosage.
- Tree-sap Gum Bases (Chicle, Mastic, Spruce, Myrrh): Natural, antioxidant-rich alternatives to plastic bases.
- Egg-shell Powder & Calcium Bentonite Clay: Provide bioavailable minerals and gentle polishing.
- Xylitol & Erythritol: Prevent cavities by reducing bacterial growth.
- Acacia Gum, Terpene Blend, Natural Mint: Aid flavor, soothe, and support absorption.
Overall, the formula looks thoughtfully constructed to support enamel and oral health without synthetic additives.
Red Flags to Consider
Counterfeit Products are Common
Third-party retailers (Amazon, Walmart, Instagram sellers like “Forrest Folk”) often ship gum that dissolves, shatters, or contains charcoal, far weaker than the genuine product. Reddit users describe it as “hard candy” labeled “Softeland” or “MIMT” from China.
Price vs. Flavor Longevity
Some users on Reddit report flavor fades quickly and consider it pricey compared to standard gum.
Nano-hydroxyapatite Debate
One Redditor mentioned concerns with controversial ingredients, for instance, charcoal additives in knockoffs may be abrasive.
Lack of Independent Data
Enamel survey results are internal and not validated by clinical research. There’s no third-party or peer-reviewed data to confirm product efficacy.
Rampant Counterfeits
Redditors and online reviews caution that many sellers (e.g., on Amazon or mass-market sites) peddle fake gum that dissolves or causes gut issues. This is a serious safety hazard.
Flavour Doesn’t Last
Multiple users note the tongue-tingling mint fades quickly—after one chew—leaving a bland but functional gum.
Does It Actually Work?
When sourced authentically, Underbrush gum offers genuine remineralization, fresher breath, and reduced sensitivity, backed by nano-hydroxyapatite science and user testimonials. However, results depend heavily on purchasing from official channels. Knockoffs are ineffective and potentially unsafe.
Alternatives
For similar results with proven ingredients:
- Boka Ela Mint nHA Toothpaste
- RiseWell Mineral Toothpaste
- Davids Sensitive + Whitening Toothpaste
- AREDS2 Dental Rinse
Conclusion
Underbrush gum from Nathan & Sons appears to be a thoughtfully formulated, natural gum that supports enamel, reduces sensitivity, and freshens breath, but only if it’s the real product. High-quality ingredients, transparent sourcing, and scientific backing make it worthwhile. However, beware of counterfeit versions that fall apart, come from unverified sellers, and fail to deliver benefits.
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