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Remineralizing gum is sugar-free gum with nano-hydroxyapatite, the mineral your enamel is made of, and it costs five to fourteen times what regular sugar-free gum costs. The part that works is well established: the American Dental Association says chewing sugar-free gum for 20 minutes after meals cuts cavities by getting your saliva going. The hydroxyapatite part is where the money goes and where the evidence thins out. Two small studies, no cavity endpoint, and not one US brand prints how much hydroxyapatite is in a piece. If you want to try it, CaviChew at $0.37 a piece is the sane entry point. If you want proven, a 7 cent piece of Orbit has the ADA Seal.
Every Remineralizing Gum, Priced Per Piece
Every price below comes from the Amazon listing, and the per-piece figure is Amazon's own unit price. The monthly number assumes one piece after each of three meals, which is how the brands tell you to use it, so 90 pieces a month. I've put two plain xylitol gums and one ADA-Seal gum at the bottom so you can see what the hydroxyapatite premium actually is.
| Gum | Price | Per Piece | |
|---|---|---|---|
| Underbrush (Nathan & Sons)Nano-hydroxyapatite, xylitol, mastic. Made in the USA. The best-known name in the category. The Name Brand | $44.9972 pieces, 4 packs | $0.62$56 a month | Check Price at Amazon |
| DentagumNano-hydroxyapatite, xylitol and erythritol. The listing claims it can "repair early cavities," which no gum has proven. Try It | $32.9760 pieces | $0.55$50 a month | Check Price at Amazon |
| EnamioNano-hydroxyapatite and xylitol. Publishes its particle size (20 nm) but not the dose. Pricey | $27.9936 pieces, 2 packs | $0.78$70 a month | Check Price at Amazon |
| Larine coHydroxyapatite and xylitol. The most expensive per piece on this list. Skip | $34.9936 pieces | $0.97$87 a month | Check Price at Amazon |
| CaviChewNano-hydroxyapatite and xylitol, aspartame free. The cheapest of the recognizable brands. Best Value nHA | $21.9960 pieces | $0.37$33 a month | Check Price at Amazon |
| ReishikingNano-hydroxyapatite and xylitol from a marketplace brand rather than a known name. Unknown Brand | $21.9990 pieces | $0.24$22 a month | Check Price at Amazon |
| PUR GumXylitol only, no hydroxyapatite. The sugar-free gum the rest of this list is competing with. Buy It | $25.99440 pieces | $0.06$5.40 a month | Check Price at Amazon |
| SpryXylitol only, from Xlear, the company built around xylitol nasal sprays and oral care. Buy It | $19.89200 pieces | $0.10$9 a month | Check Price at Amazon |
| Orbit (ADA Seal)No hydroxyapatite, but the ADA Seal of Acceptance, which requires clinical evidence. The Benchmark | $66.32960 pieces | $0.07$6.30 a month | Check Price at Amazon |
Every hydroxyapatite gum on Amazon lists nano-hydroxyapatite as an ingredient. Not one of them says how many milligrams are in a piece. Underbrush doesn't, on its listing or its own site. Enamio publishes the particle size but not the amount. Dentagum's listing goes as far as claiming the gum can "repair early cavities" without a dose or a trial behind it. The only brand we found anywhere that prints a per-piece number is Minvelle, a European gum at 5.7 mg per piece, and it isn't sold on Amazon in the US.
That matters because dose is the whole question. The hydroxyapatite toothpastes sold on Amazon advertise 10% by weight on the tube. A piece of gum weighs a gram or two, and until a brand tells you what fraction of that is the active ingredient, "contains nano-hydroxyapatite" could mean almost anything. Treat the ingredient claim as a maybe and buy on price.
Sixty pieces for $21.99, with the same two actives as Underbrush and Dentagum, nano-hydroxyapatite and xylitol, and no aspartame. It's the cheapest way to try the category from a brand with an actual website, at a bit more than half what Underbrush costs per piece. The evidence caveats on this page apply to it exactly as much as to the expensive ones; it just costs less to find out whether you like chewing it.
What The Science Actually Says
There are three separate claims stacked inside "remineralizing gum," and they don't have the same amount of evidence behind them. Here they are, pulled apart, with the studies linked at the bottom of the page.
So the ranking is the opposite of the pricing. The cheapest thing on the table, a 7 cent piece of ADA-Seal gum, has the strongest evidence. The most expensive thing, a 97 cent piece of hydroxyapatite gum, has the least. That's not a reason never to buy it; hydroxyapatite in toothpaste has real data behind it and the gum is a reasonable bet. It's a reason not to pay $87 a month for the bet.
The Hydroxyapatite Premium, Ranked
Price per piece, lowest to highest. The bar is the multiple over ADA-Seal gum at 7 cents.
Who It's For
- You already chew gum after meals and $30 a month to add a plausible ingredient doesn't bother you. Start with CaviChew.
- You get sensitive teeth. The one decent hydroxyapatite gum trial was about sensitivity, and it came out positive.
- You use a fluoride-free hydroxyapatite toothpaste and want to stay consistent. The gum matches the toothpaste, if nothing else.
- You want the mastic flavor. Underbrush's Mastic Mint is the one nobody else makes, and it's the reason a lot of people stick with it.
- You're buying it to fix a cavity. Nothing you chew does that, and Dentagum's "repair early cavities" line is a claim without a trial.
- You want proof before you pay ten times the price. Orbit has the ADA Seal for 7 cents. Nothing above it on the list has a cavity study.
- You'd be replacing brushing with it. The ADA is explicit that gum is an add-on to brushing with fluoride toothpaste, not a substitute.
- You have dogs and leave gum around. Nearly every gum on this page is sweetened with xylitol, which is toxic to dogs in small amounts.
Remineralizing Gum FAQ
The Bottom Line: Chew sugar-free gum after meals; that part is real and the ADA will back you up. Whether the piece needs hydroxyapatite in it is an open question that no brand has answered with a trial or even a dose, so pay as little as possible for the experiment. That's CaviChew at $0.37 a piece if you want the ingredient, Spry or PUR at a dime or less if you want xylitol, and Orbit at 7 cents if you want the one with the seal on the box. Underbrush is the best-known name and a fine gum, but at $56 a month you're paying for the best-known name, not for evidence the category works.
- American Dental Association, "Chewing Gum," Oral Health Topics: saliva flow, the 20-minute finding, ADA Seal requirements, and the note that gum is not a substitute for brushing and flossing.
- Dimensions of Dental Hygiene, "Wrigley Orbit, Extra and Eclipse Sugar-Free Chewing Gums Awarded ADA Seal of Acceptance" (2007).
- Riley P. et al., "Xylitol-containing products for preventing dental caries in children and adults," Cochrane Database of Systematic Reviews 2015 (CD010743): plain-language summary.
- Porciani P.F. et al., "A clinical study of the efficacy of a new chewing gum containing calcium hydroxyapatite in reducing dentin hypersensitivity," Journal of Clinical Dentistry 2014, PMID 25122980.
- Hassani A.R. et al., "Effectiveness of plant-mediated synthesis of hydroxyapatite nano-particles impregnated in Pistachio oleogum resin on mineral contents of human teeth," Journal of the Mechanical Behavior of Biomedical Materials 2023.
- "The Remineralizing and Desensitizing Potential of Hydroxyapatite in Dentistry: A Narrative Review of Recent Clinical Evidence," Journal of Functional Biomaterials 2025: the toothpaste evidence.
- Minvelle, "Remineralizing gum guide" (2026): the one brand publishing a per-piece dose (5.7 mg). A brand source, cited for its own product data only.
- Prices and piece counts: Amazon product listings for each gum, linked in the table.
