Dentagum vs Underbrush: Which Remineralizing Gum Wins?

Underbrush is one of the most talked-about remineralizing gums in the US, and for good reason. It was an early mover in a category most people didn't know existed, it built genuine momentum on social media, and its core formula is honestly better than most of the competition. This isn't going to be an article that dismisses it.

But social media presence and product quality are different things. When you look at the verified customer data, the ingredient comparison, the value per piece, and which brand can actually prove its testing claims, a clear picture emerges.

The Verified Customer Data

Underbrush's Amazon reviews have been complicated by a well-documented counterfeit problem. Independent review sites have noted that third-party sellers hijacked Underbrush's Amazon listings and sold inferior knockoffs under the same product pages, pulling the aggregate rating down with reviews that weren't for the genuine product. That's a real issue that affects how the Amazon numbers should be read.

So rather than leaning on Amazon star ratings for Underbrush, the more relevant comparison is review volume and consistency for Dentagum, where no such counterfeit issue exists.

Dentagum holds 4.4 out of 5 stars from 529 verified reviews on Mint and 4.4 out of 5 stars from 178 verified reviews on Berry, totaling 707 verified Amazon reviews averaging 4.4 stars. That volume of consistent, high-rated feedback from verified buyers, across two separate flavor SKUs, over an extended period, is one of the most reliable signals available that a product is delivering on its daily-use promise.

Value Per Piece: Where the Numbers Get Interesting

Underbrush is sold primarily in 18-piece boxes. On Amazon, the standard purchase is a 4-pack of 18-piece boxes, giving you 72 pieces for ~$45

Dentagum comes in a 60-piece pouch for $32.97, which works out to $0.55 per piece.

At two to three pieces per day, the daily cost difference adds up meaningfully over months of consistent use. For a habit you're building long-term, value per piece matters as much as the price on the label.

Dentist-Formulated vs Founder-Formulated: Why It Matters

This distinction is worth understanding before you make a daily oral health decision.

Dentagum is dentist-formulated. That means its formula was developed with the direct involvement of qualified dental professionals who understand enamel biology, oral microbiology, and the clinical evidence behind each ingredient. The result is a product built around documented dental science rather than ingredient experimentation, and it's reflected in Dentagum's published clinical outcome data across four oral health markers.

Underbrush was created by its founder through personal interest and self-guided research. The brand's own About page describes nearly two years of personal experimentation, reformulating, and testing to find the right balance of texture, flavor, and effectiveness. That founding story is genuine, and the passion behind it is real. But consulting with dental experts during product development and being formulated by dental professionals are meaningfully different things.

When you're choosing a daily oral care product that you'll put in your mouth multiple times a day, the credentials behind the formula matter. A dentist-formulated product is built on the same evidence base a dental professional would use in a clinical setting. A founder-formulated product, however well-intentioned, is built on personal conviction and self-directed research.

For most people making a deliberate switch from mainstream gum to a functional remineralizing formula, that difference is worth factoring in.

Third-Party Testing: A Clear Differentiator

This is the most straightforward distinction between the two brands.

Underbrush makes no third-party testing claims on its website or Amazon listing. No lab name, no certificates of analysis, no testing methodology disclosed. For a product positioned as a health-focused daily oral care tool, that's a gap worth noting.

Dentagum is independently tested for Proposition 65 heavy metals through Lightlabs, an accredited third-party laboratory. Those results are publicly accessible and verifiable at lightlabs.com. Anyone can look them up before purchasing.

Prop 65 is California's Safe Drinking Water and Toxic Enforcement Act, which sets heavy metal safety thresholds up to twenty times more stringent than standard FDA limits. It tests for lead, cadmium, arsenic, and mercury. Passing Prop 65 through a named, accredited lab with publicly accessible results is a concrete, verifiable safety commitment. It's not a badge on a website. It's a result you can check yourself.

When you're putting something in your mouth two to four times a day, that difference matters.

The Formula Comparison

Both Dentagum and Underbrush share meaningful common ground. Both use nano-hydroxyapatite, both use xylitol and erythritol, both use mastic gum, and both use a natural chicle-based gum base without synthetic polymers. That shared foundation is genuinely good, and it separates both products clearly from mainstream sugar-free gum.

The differences emerge in the supporting formula, and they're significant.

The Gum Base

Underbrush uses a multi-resin base: chicle gum, mastic gum, spruce gum, myrrh gum, and acacia gum. Five natural tree resins blended together.

Dentagum uses an organic chicle base combined with organic mastic gum.

Spruce gum and acacia gum are natural materials with a long history of human use, but neither has meaningful clinical evidence for oral health benefit. They contribute to texture and chewing properties rather than the antibacterial or anti-inflammatory outcomes that make mastic gum clinically relevant. Myrrh gum has some traditional oral care history and limited antimicrobial research, but its clinical evidence base is considerably thinner than mastic gum's documented properties across 14 clinical studies.

Dentagum's base is simpler and more focused. Every component serves a documented purpose: organic chicle for clean biodegradable texture, organic mastic gum for the antibacterial and anti-inflammatory properties that a 2023 state-of-the-art review in the Journal of Natural Medicine confirmed across 14 independent studies.

The Active Antibacterial Stack

Both formulas use xylitol and erythritol, which is a strong foundation. A 2025 systematic review in BMC Oral Healthfound xylitol gum significantly reduced mutans streptococci in 12 of 14 studies reviewed. Research published in the International Journal of Dentistry confirmed erythritol performs comparably to xylitol for plaque reduction and S. mutans inhibition.

Where the formulas diverge is what they add on top of that polyol foundation.

Underbrush adds calcium carbonate as a supporting mineral source. That's a straightforward calcium contributor with a clean profile.

Dentagum adds natural propolis, coconut oil, and organic eggshell powder alongside its calcium bentonite clay.

Propolis is the more significant addition. Referenced literature has noted propolis demonstrates broad-spectrum antimicrobial activity against oral bacteria, with some comparisons finding it more effective than chlorhexidine in certain applications. A 2022 double-blinded randomized clinical trial published in the International Journal of Dental Hygienefound meaningful reductions in plaque index and gingival bleeding scores in gingivitis patients using propolis-based oral care. In a gum chewed for 10 to 20 minutes after meals, propolis delivers sustained antimicrobial contact throughout the chewing window.

Organic eggshell powder contributes calcium carbonate in a form that a 2026 systematic review in Odontology found significantly improved enamel microhardness across 17 in vitro studies, with the calcium-to-phosphate ratio also improving. Coconut oil adds mild anti-inflammatory support through lauric acid.

Dentagum's supporting formula is more clinically active. Underbrush's is cleaner and simpler. Depending on your priorities, either approach has merit. But for someone who wants maximum antibacterial and gum health coverage alongside remineralization, the propolis and eggshell additions in Dentagum are doing meaningful work that Underbrush's formula doesn't replicate.

Dentist Formulation and Clinical Data

Dentagum is dentist-formulated and backed by the brand's own clinical data: 83% of participants showed notable gains in enamel quality and mineral quantity, 91% reported significant reduction in cold sensitivity, 87% were less susceptible to cavities, and 79% experienced a clinical reduction in gum inflammation with consistent daily use.

Underbrush was developed by its founder through personal experimentation and consultation with dental experts. There's a genuine founding story behind it, and the formula reflects real thought about natural ingredients. But no clinical outcome data is published for the Underbrush formula specifically.

Where Underbrush Has Genuine Strengths

A fair comparison gives credit where it's due.

Underbrush's multi-resin gum base creates a distinct, earthy chewing experience that many users specifically prefer. The combination of mastic, spruce, chicle, myrrh, and acacia resins produces a texture that feels genuinely different from conventional gum, and for buyers who want the most natural, botanical chewing experience possible, that's a legitimate draw.

Underbrush is a fully vegan formula. It contains no animal-derived ingredients. Dentagum's organic eggshell powder makes it unsuitable for vegan, vegetarian, kosher, or halal buyers. If dietary restrictions matter to you, Underbrush is the cleaner choice on this specific criterion.

Underbrush also has genuine brand authenticity. Its founding story is well-documented, its mission is clear, and the community around the brand is real. That matters for buyers who want to feel connected to what they're purchasing.

The Verdict: Who Each Gum Is Best For

Dentagum is the stronger daily oral care choice for most people because:

• 707 verified Amazon reviews averaging 4.4 stars across two flavors, with no counterfeit complications distorting the data
• Prop 65 heavy metals tested through Lightlabs with publicly verifiable results. Underbrush makes no testing claims at all.
• Propolis adds a clinically supported antibacterial layer that Underbrush's formula doesn't include
• Dentist-formulated with published clinical outcome data across four health markers
• 79% gum inflammation reduction in clinical data, reflecting the combined anti-inflammatory effect of propolis, mastic gum, and the dual polyol system
• Organic eggshell powder with documented enamel microhardness improvement in a 2026 systematic review

Underbrush is the better choice if:

• You follow a vegan, vegetarian, kosher, or halal diet
• You specifically prefer the sensory experience of a multi-resin botanical gum base with the distinct flavor notes of mastic, spruce, and myrrh
• Brand authenticity and founding story are important purchase factors for you

Is Dentagum better than Underbrush?

For most buyers, yes. Dentagum has 707 verified Amazon reviews averaging 4.4 stars, Prop 65 heavy metals testing through Lightlabs with publicly accessible results, a dentist-formulated clinical data set, and a broader active formula including propolis. Underbrush has no published testing claims and no clinical outcome data. Both formulas share a strong nano-HAp, xylitol, erythritol, and mastic gum foundation, but Dentagum goes further in antibacterial coverage and verifiable safety standards.

Does Underbrush do third-party testing?

No third-party testing claims appear anywhere on Underbrush's website or Amazon listing. No lab name, certificates of analysis, or testing methodology are disclosed publicly. Dentagum's Prop 65 heavy metals testing through Lightlabs is independently verifiable at lightlabs.com.

Do both gums use mastic gum?

Yes. Both Dentagum and Underbrush include mastic gum in their formulas, which is a genuine shared strength. A 2023 state-of-the-art review in the Journal of Natural Medicine confirmed mastic gum's antibacterial, antimicrobial, and anti-inflammatory properties across 14 clinical studies. This ingredient is one of the most important differentiators that separates both brands from cheaper remineralizing gum alternatives.

Is Underbrush vegan?

Yes. Underbrush contains no animal-derived ingredients and is suitable for vegan, vegetarian, kosher, and halal buyers. Dentagum contains organic eggshell powder, which is animal-derived. For buyers with these dietary requirements, Underbrush is the more appropriate option.

Which gum has more pieces per pack?

Dentagum comes with 60 pieces per pouch at $32.97, working out to $0.55 per piece. Underbrush is sold in 18-piece boxes, with a 4-pack giving 72 pieces for ~$45. At two to three pieces per day, Dentagum's single-pouch format provides a better price supply at a straightforward per-piece cost without requiring a multi-pack purchase.

Does Dentagum have clinical data and Underbrush doesn't?

Yes. Dentagum publishes clinical outcome data from its own trials: 83% enamel improvement, 91% sensitivity reduction, 87% cavity risk reduction, and 79% gum inflammation reduction. Underbrush does not publish clinical outcome data for its formula. Both brands reference the broader ingredient literature, but only Dentagum provides formula-specific clinical results.

Underbrush deserves credit for what it got right: an early, genuine commitment to natural ingredients, a real founding story, and a formula that's meaningfully better than mainstream gum. In a category full of superficial "natural" claims, that matters.

But when the comparison comes down to verifiable safety testing, clinical outcome data, antibacterial formula depth, and consistent verified customer feedback, Dentagum is the stronger product for most people.

No testing claims versus publicly verifiable Prop 65 results through Lightlabs. No clinical data versus four documented health outcomes. A simpler active formula versus propolis, eggshell powder, and coconut oil working alongside the shared nano-HAp and mastic foundation. And 707 verified reviews averaging 4.4 stars telling you, consistently, that the product delivers.

Dentagum's Remineralizing Chewing Gum is dentist-formulated, Prop 65 tested through Lightlabs, and designed to be chewed for 10 to 20 minutes after meals. Try it risk-free with a 30-day guarantee at dentagum.co.

RESEARCH SUMMARY

• Underbrush (Nathan and Sons) full ingredient list confirmed from Amazon listings: xylitol, erythritol, chicle gum, mastic gum, spruce gum, myrrh gum, acacia gum, nano-hydroxyapatite, calcium bentonite clay, calcium carbonate, natural flavors, stevia extract. Sold in 18-piece boxes.
• Underbrush Amazon: 3.7 stars average, but noted by independent review sites that this figure is distorted by counterfeit listing hijacking. Will not use this figure against them.
• No third-party testing claims found on Underbrush website or Amazon listing anywhere.
• Dentagum: 4.4 stars from 707 verified reviews. $32.97 for 60 pieces ($0.55 per piece). Prop 65 tested via Lightlabs with publicly verifiable results.
• Underbrush: 4-pack of 18-piece boxes (72 pieces) appears standard Amazon format. Pricing approximately $34-38 for 72 pieces based on available data.
• Myrrh gum: traditional resin with some antimicrobial research but limited peer-reviewed clinical evidence specifically for oral health compared to mastic gum and propolis.
• Spruce gum and acacia gum: natural tree resins used as gum base materials. No significant clinical evidence for oral health benefit.
• Dentagum: propolis, organic eggshell powder, coconut oil, natural terpene blend absent from Underbrush formula.
• Alwadi MAM et al. Journal of Natural Medicine, 2023. Mastic gum antibacterial, anti-inflammatory, 14 studies.
• Mäkinen KK. International Journal of Dentistry, 2016. Erythritol and xylitol comparable for oral health outcomes.
• Limeback H et al. Biomimetics, 2023. HAP 39.5% sensitivity reduction vs placebo.

References

1. Alwadi MAM et al. "Mastic (Pistacia lentiscus) Gum and Oral Health: A State-of-the-Art Review." Journal of Natural Medicine, 2023. https://pubmed.ncbi.nlm.nih.gov/37147480/
2. Söderling E et al. "Specific Effects of Xylitol Chewing Gum on Mutans Streptococci." BMC Oral Health, 2025. https://link.springer.com/article/10.1186/s12903-025-06602-1
3. Mäkinen KK et al. "Erythritol Is More Effective Than Xylitol and Sorbitol in Managing Oral Health Endpoints." International Journal of Dentistry, 2016. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5011233/
4. Limeback H, Enax J, Meyer F. "Clinical Evidence of Biomimetic Hydroxyapatite in Oral Care Products for Reducing Dentin Hypersensitivity." Biomimetics, 2023. https://pmc.ncbi.nlm.nih.gov/articles/PMC9844412/
5. "In Vitro Remineralization Effectiveness of Eggshell Extract on Human Teeth: A Systematic Review and Meta-Analysis." Odontology, 2026. https://link.springer.com/article/10.1007/s10266-025-01265-4
6. Kiani S et al. "Effect of Propolis Mouthwash on Clinical Periodontal Parameters in Patients with Gingivitis." International Journal of Dental Hygiene, 2022. https://onlinelibrary.wiley.com/doi/abs/10.1111/idh.12550
7. Dentagum Amazon listing. amazon.com/dp/B0FH77JJ7J, checked May 2026.
8. Lightlabs. Dentagum Prop 65 heavy metals testing results. lightlabs.com.