Your teeth on conventional toothpaste
Your teeth on Tooth Armor
The difference isn't cosmetic. It's mineral. Most toothpaste removes surface plaque. Tooth Armor puts the mineral back.
15% Nano-Hydroxyapatite — Concentration Published on Every Label
Matched Sensodyne in 8-Week Clinical Trial
Rod-Shaped Particles That Bond to Enamel
Reduces Cold-Water Sensitivity
Supports Gum Health
No Glycerin, No Silica Filler
Dentist Formulated
Free of Fluoride, SLS, Parabens
Studied for Enamel Remineralization
60-Day Money-Back Guarantee
15% Nano-Hydroxyapatite — Concentration Published on Every Label
Matched Sensodyne in 8-Week Clinical Trial
Rod-Shaped Particles That Bond to Enamel
Reduces Cold-Water Sensitivity
Supports Gum Health
No Glycerin, No Silica Filler
Dentist Formulated
Free of Fluoride, SLS, Parabens
Studied for Enamel Remineralization
60-Day Money-Back Guarantee
What's Actually Happening to Your Teeth
Every day you skip this, the damage compounds. Here's what the dental industry trained your dentist not to explain.
Problem 1
The Numb-and-Hope Trap
Potassium nitrate — the active in Sensodyne and Pronamel — works by blocking the nerve signal inside your tooth. The cold water is still reaching the nerve. The enamel is still thinning. You just can't feel the alarm anymore. This is why relief only lasts as long as you keep using it. The moment you stop — even for a week — the sensitivity returns. Because the cause was never addressed. It was muffled.
MASKS PAIN WITHOUT FIXING IT
WORKS ONLY WHILE ACTIVELY USING
DOES NOT REPLACE LOST MINERAL
DAMAGE CONTINUES UNDER THE SURFACE
Problem 2
The Concentration Gap
The hydroxyapatite toothpaste market is now worth over $1 billion — and most of it is underdosed. Most brands use 2–5% hydroxyapatite dissolved in 70–80% filler and call it a "remineralizing" product. The clinical research that showed hydroxyapatite works used 10–15%. A brand can technically print "made with hydroxyapatite" on the label while delivering nowhere near the dose that was studied. Pick up any major brand right now. Try to find the concentration. Most won't print it. There's a reason.
NO CONCENTRATION PUBLISHED
2–5% DOSE BELOW CLINICAL THRESHOLD
FILLER DILUTES THE ACTIVE MINERAL
BRIEF CONTACT TIME = MINIMAL ABSORPTION
Problem 3
The At-Home Decay
Every time you drink coffee, wine, soda, or anything acidic — which is most of what most people consume — acid pulls calcium and phosphate ions directly out of your enamel surface. Your saliva is supposed to put them back. In a healthy, younger mouth, the cycle balances. After 40, three things break it: saliva flow drops (especially during perimenopause), acid exposure compounds over years, and your body cannot manufacture new enamel from scratch. The result: enamel gets thinner every day, between dental visits, while your toothpaste does nothing about mineral loss.
ENAMEL THINS DAILY BETWEEN VISITS
SALIVA CAN'T KEEP UP AFTER 40
STANDARD TOOTHPASTE CLEANS, DOESN'T REBUILD
DAMAGE COMPOUNDS SILENTLY FOR MONTHS
Problem 4
The Drill-and-Bill Model
Dentistry as a billing model is built for procedures, not prevention. When you walk into the chair with early-stage enamel decline — transparent edges, mild sensitivity, a cavity that's just starting — the only tool the system has is: "Let's monitor it and come back in six months." By the time the problem is billable enough to address, it's a $1,400 crown, a $1,800 root canal, or a $4,000 implant if the tooth is lost. There's no code for "at-home mineral replacement." So dentists don't prescribe it. That gap is exactly why Dr. Bernhardt built Reumi.
NO AT-HOME PREVENTION PROTOCOL IN STANDARD CARE
"MONITOR IT" = WAIT FOR IT TO GET EXPENSIVE
$1,400 → $1,800 → $4,000 COST CLIFF
THE IN-BETWEEN TOOL HASN'T EXISTED. UNTIL NOW.
Problem 5
Whitening Strip Damage
Hydrogen peroxide whitening strips brighten by chemically oxidizing the enamel surface. The process works — teeth look whiter. But it opens microscopic pores in the enamel, increases tubule exposure, and frequently creates permanent sensitivity in people with already-thinning enamel. Millions of women in their 40s and 50s now carry permanent cold-water sensitivity as a direct result of whitening strips they used in their 30s. The strips were sold as cosmetic care. They were enamel damage.
CHEMICAL OXIDATION OPENS ENAMEL PORES
INCREASES SENSITIVITY — OFTEN PERMANENTLY
MOST DAMAGING FOR ALREADY-THINNING ENAMEL
WHITENING STRIPS DON'T REBUILD WHAT THEY REMOVE
THE TRUTH ABOUT YOUR TEETH
Your teeth are losing mineral. Every single day.
Every time you eat or drink anything acidic — which is most things — acid pulls calcium and phosphate directly out of your enamel surface. In a healthy, younger mouth, your saliva replaces it. After 40, saliva production drops — especially during perimenopause — and the balance tips. More leaves than comes back. That's not an aging metaphor. It's the literal chemistry happening at your bathroom sink every morning.
IT'S NOT JUST WHAT YOU BRUSH WITH
You can see it. You can feel it. It's been building for years.
Enamel is not a sealed surface — it's a crystalline mineral matrix with open microscopic pores. The translucent, glassy look at the edges of your front teeth? That's enamel that has lost so much mineral it's physically thin enough to let light pass through. The white spots near your gums? Mineral-depleted zones where remineralization can no longer keep up. These are not cosmetic problems. They're structural ones — and they're readable by any practicing dentist long before a procedure is necessary.
THE DAMAGE YOU CAN FEEL
Sensitivity. Transparency. White spots. That's not aging. That's mineral starvation.
The symptoms most women in their 40s describe — wincing at cold drinks, the glassy transparent look at the edge of the front teeth, white chalky patches, gums that seem to be pulling back, teeth that look more yellow or grey near the roots — are all manifestations of the same underlying process: demineralization outpacing remineralization over years. Your dentist told you to monitor it. Sensodyne numbed it. Neither gave you the mineral back.
THE TOOL THAT FILLS THE GAP
Stop the damage before it becomes a procedure.
Tooth Armor Drops deliver 15% nano-hydroxyapatite — the exact mineral your enamel is made from — at the concentration studied in an 8-week double-blind clinical trial, in a drop format that holds the mineral against your tooth long enough to actually bond. No filler. No 30-second rinse washing it away. Just the mineral your enamel is asking for, in the form it can use, at the dose that's been shown to work. Applied at home, twice a day, in two minutes.
REAL PEOPLE. REAL RESULTS.
50,000+ people made the switch. Here's why they stayed.
Thousands of people have already moved from the guess-and-monitor model to daily mineral replacement with Tooth Armor. Cold-water sensitivity that's been present for years clearing up in two weeks. Dental checkups where the dentist notes improved enamel for the first time. A canceled crown procedure because the tooth had strengthened enough that the urgency passed. These aren't testimonials written in a marketing office. They're the result of giving teeth the mineral they've been asking for.
The Numbers Behind the Results
Collected from verified Reumi customers.
reported their tooth sensitivity significantly improved — or completely disappeared — within 60 days.
noticed visibly stronger, less transparent teeth and an overall healthier-looking smile within 90 days.
Say they'd recommend Tooth Armor to a friend or family member
Most customers reported measurable improvement in cold-water sensitivity within the first two weeks of twice-daily use. Structural enamel changes develop over 60–90 days.
Clinical Review
Formulated by two practicing DMDs with 20+ years combined clinical experience.
Dr. Melissa Bernhardt, DMD
Verified Clinical
Speciality
General Dentistry
Years In Practice
10+
Most customers reported measurable improvement in cold-water sensitivity within the first two weeks of twice-daily use.
Structural enamel changes develop over 60–90 days.
Sensitivity Relief, Enamel Support, Daily Use
Dr. Mary Rock, DMD
Verified Clinical
Speciality
General Dentistry
Years In Practice
20+
15% nano-hydroxyapatite matched prescription-strength Sensodyne Repair & Protect at every measurement point for sensitivity relief.
Amaechi et al., BDJ Open 2021, University of Texas Health San Antonio
8-Week Double-Blind RCT · NCT02918617 · n=85
Nano-Hydroxyapatite, Clinical Study, Sensitivity Relief
Clinical Review
Dr. Melissa Bernhardt, DMD
Verified Clinical
Speciality
Practicing Dentist
Years In Practice
10+
Dr. Mary Rock, DMD
Verified Clinical
Speciality
Practicing Dentist
Years In Practice
10+
Amaechi et al., BDJ Open 2021 University of Texas Health San Antonio 8-Week Double-Blind RCT · NCT02918617 · n=85
15% nano-hydroxyapatite matched prescription-strength Sensodyne Repair & Protect at every measurement point for sensitivity relief.
What people are saying about Tooth Armor.
Verified reviews from women who stopped monitoring and started rebuilding.
You've Got Questions. Here Are Straight Answers.
Why do I need a remineralizing drop if I'm already brushing and flossing?
Brushing and flossing remove bacteria and plaque from the tooth surface. They don't replace the mineral the acid in your diet strips out every day. That's a separate process called remineralization, and your saliva handles it — until saliva production drops with age, perimenopause, or medications. When saliva can't keep up, the mineral leaves faster than it comes back. Brushing doesn't put it back. Tooth Armor does.
What's the actual concentration of hydroxyapatite in this product?
15% nano-hydroxyapatite. It's printed on every label, every bottle, every shipment. Most brands use 2–5% and don't disclose the number. We publish ours because the concentration is the point — it's the variable an 8-week double-blind clinical trial at the University of Texas Health San Antonio showed determines whether the ingredient actually performs.
How is this different from Sensodyne or Pronamel?
Sensodyne and Pronamel use potassium nitrate to block the nerve signal inside the tooth so you can't feel the sensitivity pain. The cold water is still reaching your nerve. The enamel is still thinning. The toothpaste just pulled the batteries out of the smoke alarm. Tooth Armor physically fills the open dentinal tubules that cause sensitivity with mineral — addressing the cause, not muffling the symptom. That's why Sensodyne only works while you use it and Tooth Armor shows cumulative improvement over time.
How is this different from BOKA, RiseWell, or NOBS?
Those are all legitimate products using hydroxyapatite at concentrations in the 5–10% range. The 2021 University of Texas clinical trial tested 15% versus 10% head-to-head — and 15% outperformed 10% at every measurement point, matching prescription-strength Sensodyne while 10% did not. The format also differs: Tooth Armor is a drop held against the teeth for 2–3 minutes. Pastes typically rinse off within 30 seconds. Contact time and concentration together determine absorption.
Can enamel actually be rebuilt, or is "remineralization" just marketing?
Enamel cannot be regrown — your body cannot generate new enamel from living cells, because enamel doesn't have them. What it can do is absorb mineral from its environment and refill the microscopic pores and channels that form when demineralization outpaces remineralization. That process is real, well-documented in peer-reviewed dental literature, and the basis of the ADA's endorsement of hydroxyapatite for pediatric use. Tooth Armor provides the mineral — at 15% — that your enamel uses to do exactly this.
How long before I see results?
Most customers notice measurable improvement in cold-water sensitivity within 14 days of twice-daily use. Enamel structural improvements — reduced translucency, improved opacity, smoother surface texture — develop over 60–90 days. We offer a 60-day money-back guarantee because we believe in this timeline and want you to have the full cycle to verify it.
I'm in perimenopause. Is this specifically helpful for me?
Yes — and this is the angle almost no oral care brand addresses. Estrogen receptors exist throughout your salivary glands, gum tissue, and jawbone. As estrogen drops during perimenopause, saliva production decreases, and saliva is the body's mechanism for naturally remineralizing enamel throughout the day. When saliva can't keep up, enamel loss accelerates — which is why 70% of women over 50 report oral health changes at menopause. Tooth Armor is the daily mineral replacement for what perimenopause is removing.
Is it safe? What are the ingredients?
The full ingredient list and concentration of every active are on the label and on our website. The primary active — 15% nano-hydroxyapatite — is approved by the European Union's Scientific Committee on Consumer Safety at concentrations up to 29.5%. Our formula is free of fluoride, SLS, parabens, glycerin, silica filler, and artificial flavors. The supporting actives — xylitol, baking soda, tea polyphenols, myrrh, bromelain, and the traditional herbal layer — are each documented in peer-reviewed literature.
What's your guarantee?
60-day money-back guarantee — no return-the-bottle gotcha. If you're not satisfied after 60 days of use, email support@myreumi.com for a full refund. We also offer a 180-day unopened-return policy and a lifetime warranty on the formula. Free worldwide express shipping and free returns are included on every order.
Why Two Dentists Built Something Their Industry Doesn't Offer
A few years ago, a patient came into Dr. Bernhardt's chair. Woman in her late 40s. Two kids. She had early-stage enamel decline — transparent edges on her front teeth, mild sensitivity, a small cavity just starting. Not a crisis. But clearly on her way to one.
The patient looked at her and asked: "Is there nothing I can do at home?"
Dr. Bernhardt told her the truth: "Not really. Not anything that would actually work."
That night she drove home thinking about that answer — and decided it wasn't good enough. She had the clinical training. She had the formulation knowledge. She had the frustration of watching the same slow dental crisis unfold in patient after patient — women told to "monitor it," coming back two years later needing a $5,000 procedure that could have been prevented at home.
She built Reumi for the in-between. Not as a protest against dentistry. As the take-home tool the system doesn't have.
Dr. Melissa Bernhardt, DMD — Founder, Reumi Dental · Practicing Dentist
Formula co-developed with Dr. Mary Rock, DMD — Co-Founder · 20+ Years Clinical Experience
Why Reumi
Concentration Transparency
We print our hydroxyapatite concentration on every label. 15%. Not "made with hydroxyapatite" — a number you can compare, challenge, and verify. In a category where most brands hide their dose because it's too low to defend, transparency is the baseline.
Ingredients With Evidence
Every active in Tooth Armor is in the formula because peer-reviewed literature or centuries of clinical use supports it being there. We publish our ingredient rationale, link to the studies, and include a Transparency Card in every box.
Built for the Patient the System Couldn't Reach
Dental care costs what it costs. A crown is $1,400. A root canal is $1,800. An implant is $4,000. Reumi was built by a dentist who was tired of watching patients choose which kid got the procedure and which one waited. The at-home tool should not require a dental plan.
Dentist-Founded. Not Founder-Story Marketing
Dr. Bernhardt and Dr. Rock are both practicing DMDs. They still see patients. They built this product for the patients they couldn't help inside the chair. They are not influencers. They are not wellness entrepreneurs. They are dentists who decided to fill the gap the billing system left open.
Your Teeth Were Designed To Rebuild. They Just Need The Mineral.
15% nano-hydroxyapatite. Rod-shaped particles. Two minutes a day. 60-day money-back guarantee. Free worldwide shipping.
Try Tooth Armor Drops — $34.99
"Try it for two weeks. If your cold-water sensitivity hasn't started to change, email us and you'll have your money back. Sixty-day guarantee, no return-the-bottle gotcha."
"Try it for two weeks. If your cold-water sensitivity hasn't started to change, email us and you'll have your money back. Sixty-day guarantee, no return-the-bottle gotcha."
— Dr. Melissa Bernhardt, DMD · Founder, Reumi Dental