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Duo Toothpaste FAQ
Product Basics
What is Duo Toothpaste?
Duo is a tablet-based toothpaste alternative developed by dentists and physicians. Instead of a tube, you chew a tablet, brush with a wet toothbrush, and it foams into a clean, refreshing paste.
How do Duo toothpaste tablets work?
You chew one tablet until it breaks down into a paste, then brush as normal with a wet toothbrush. The act of brushing activates the formula with cleaning and remineralizing agents like nano-hydroxyapatite.
Does Duo replace regular toothpaste?
Yes. Duo is designed to completely replace traditional toothpaste. It cleans teeth, freshens breath, and supports enamel health.
Do Duo tablets foam like regular toothpaste?
They produce a mild, gentle foam without harsh detergents like SLS. This is enough to clean effectively but avoids the irritation that comes with high-foaming formulas.
Why is Duo in tablet form instead of paste?
Tablets eliminate plastic tubes, allow precise dosing, reduce mess, and are travel-friendly. They’re also more sustainable and hygienic.
Fluoride & Hydroxyapatite
Does Duo toothpaste contain fluoride?
No, Duo is fluoride-free. Instead, it uses nano-hydroxyapatite (nHa), a biomimetic mineral that rebuilds enamel and reduces sensitivity.
Why doesn’t Duo include fluoride?
Many people seek fluoride-free options due to health concerns, allergies, or personal choice. Hydroxyapatite provides enamel protection and cavity resistance without fluoride.
Can I still prevent cavities without fluoride?
Yes. Nano-hydroxyapatite has been shown in clinical studies to remineralize enamel, reduce sensitivity, and help prevent cavities.
What percentage of nano-hydroxyapatite is in Duo?
Duo contains 5% nano-hydroxyapatite, the level used in clinical studies in Japan and Europe showing enamel remineralization effectiveness.
Why not 10% nano-hydroxyapatite like some studies suggest?
Clinical evidence supports effectiveness at both 5% and higher. Duo balances efficacy with taste, safety, and product stability.
Is nano-hydroxyapatite safe?
Yes. It’s the same mineral your teeth are made of. Used widely in Japan for decades, it’s considered safe and effective for dental use.
Does Duo offer a fluoride + hydroxyapatite option?
Currently, Duo is fluoride-free, but we’re exploring options that combine both ingredients for those who want the gold standard of cavity prevention.
How does hydroxyapatite compare to fluoride?
Hydroxyapatite rebuilds enamel by directly bonding to it. Fluoride works indirectly by forming fluorapatite. Both are effective, but Duo prioritizes fluoride-free solutions.
Does Duo cause fluorosis like fluoride can?
No. Hydroxyapatite is biomimetic and does not cause fluorosis.
Is hydroxyapatite synthetic or natural?
Duo uses lab-purified hydroxyapatite that is safe, consistent, and free from animal bone contamination or heavy metals.
Ingredients & Safety
Does Duo contain sodium lauryl sulfate (SLS)?
No. Duo is SLS-free, making it gentler on sensitive mouths.
Is Duo safe if swallowed?
Yes. While not designed to be swallowed, it is safe if accidentally swallowed.
Does Duo contain xylitol?
Yes. Xylitol helps fight cavity-causing bacteria, but it can be harmful to dogs and cats. Always store tablets away from pets.
Is Duo safe for diabetics since it contains xylitol?
In typical brushing amounts, xylitol should not raise blood sugar levels significantly. If you have concerns, consult your physician.
Is Duo gluten-free?
Yes. Duo is gluten-free and safe for people with celiac disease.
Is Duo vegan?
Yes. The vitamin D is plant-sourced (not from lanolin), and no animal-derived ingredients are used.
Does Duo contain coconut or soy derivatives?
No. We carefully select ingredients to avoid common allergens like coconut, soy, and peanuts. Contact us if you have a specific allergy concern.
Is Duo safe for children?
Yes, children can use Duo under adult supervision. For younger kids, tablets can be split in half.
Can Duo be used with sensitive teeth?
Yes. Hydroxyapatite reduces sensitivity by sealing exposed dentin.
Is Duo safe for crowns, veneers, or implants?
Yes. Duo is safe and effective for people with dental work.
Usage & Instructions
How do I use Duo toothpaste tablets?
Chew one tablet, brush with a wet toothbrush for two minutes, spit, and (optionally) don’t rinse to leave protective minerals on your teeth.
Can I use an electric toothbrush with Duo?
Yes. Duo works with both manual and electric toothbrushes.
Do I need to rinse after brushing with Duo?
No. In fact, skipping the rinse allows hydroxyapatite to stay on your enamel longer.
How many times a day should I use Duo?
Brush 2–3 times daily, just like with traditional toothpaste.
Can I use Duo on the go without spitting?
While it is not intended to be swallowed, it is safe to swallow.
Does Duo replace mouthwash?
For many, yes. Hydroxyapatite strengthens enamel, and xylitol reduces bacteria, so an extra rinse isn’t always needed.
Can Duo tablets be split in half?
Yes, especially for children or those who want a lighter dose.
Do I need to use a water flosser or mouthwash with Duo?
Duo works well alone, but combining with flossing or a water flosser enhances oral health.
Does Duo expire?
Yes, typically 18–24 months from manufacture. Refill pouches are labeled with expiration dates.
Can Duo tablets melt in hot mailboxes?
They’re stable up to high temperatures but should be stored in a cool, dry place.
Whitening & Effectiveness
Does Duo whiten teeth?
Yes. Hydroxyapatite gently polishes enamel and helps reduce stains naturally.
How fast will I notice whitening with Duo?
Many users notice brighter teeth within 1–2 weeks of regular use.
Does Duo remove plaque and tartar?
Yes. With proper brushing, Duo helps reduce plaque buildup and supports gum health.
Does Duo help with gum sensitivity?
Yes. Users often report healthier gums with reduced bleeding and inflammation.
Can Duo repair cavities?
While no toothpaste can fully reverse deep cavities, hydroxyapatite can help remineralize early-stage lesions.
Special Formulas (Sleep, Immunity, Energy)
What is Duo Sleep?
A toothpaste tablet with 1.5 mg melatonin to support bedtime relaxation and oral health.
Can I use Duo Sleep in the morning?
It may cause drowsiness; we recommend using only at night.
Does melatonin in Duo cause grogginess?
Most users tolerate 1.5 mg well. If sensitive, you can split the tablet.
What is Duo Energy?
A tablet with caffeine and B12 for a refreshing morning clean and subtle boost.
How much caffeine is in Duo Energy?
About 1/5 of a cup of coffee (approx. 20–30 mg), for a gentle lift without jitters.
What is Duo Immunity?
A tablet with vitamins D3 and B12 to support oral and systemic health while brushing.
Are vitamins in toothpaste actually absorbed?
Yes, absorption occurs through a process called mucosal absorption. You do not need to swallow for the supplements to be absorbed into your system.
Is Duo Sleep safe for kids?
Not recommended for young children without consulting a physician due to melatonin.
Is Duo Energy safe for people sensitive to caffeine?
It contains a low dose, but sensitive individuals may want to avoid it.
Can I use Duo Immunity if I already take supplements?
Yes, the doses are small and designed for daily brushing, but consult your doctor if you’re concerned about interactions.
Packaging & Sustainability
Is Duo packaged in plastic?
No. Duo comes in glass jars and compostable refill pouches.
Do you offer refill packs without glass bottles?
Yes. Customers can order refill pouches to reduce waste.
Why not package in aluminum instead of glass?
Glass is inert, recyclable, and safer for storing active ingredients.
Is Duo good for travel?
Yes. TSA-approved tablets are spill-proof and mess-free.
Is Duo eco-friendly?
Yes. Duo eliminates plastic tubes and uses sustainable packaging.
Comparisons & Competitors
How is Duo different from Bite toothpaste tablets?
Duo adds functional benefits (like sleep support, energy, immunity) as well as nano-hydroxyapatite for enamel health. Duo is formulated and founded by dentists, while Bite focuses more on sustainability but lacks Duo’s advanced oral care features.
How does Duo compare to Hello or David’s toothpaste?
Unlike David’s, all Duo Toothpaste products use nano-hydroxyapatite. Hello includes fluoride and plastic tubes, while Duo is plastic-free, fluoride-free, and focused on remineralization and oral wellness.
Is Duo better than baking soda for teeth?
Baking soda cleans surface stains, but Duo adds remineralization, sensitivity relief, and vitamin support. Duo contains a small amount of baking soda for gentle cleaning and pH balance.
How is Duo different from regular toothpaste?
Duo is plastic-free, fluoride-free, mess-free, and powered by hydroxyapatite. It’s backed by science and crafted by dentists to elevate your brushing routine.
Is Duo approved by dentists?
Yes. Duo was developed by dentists and physicians and is recommended by oral health professionals.
Safety & Health Concerns
Is Duo safe for people with kidney issues?
Yes, but it is always wise to consult your doctor if you have serious medical conditions.
Can Duo cause allergies?
Rarely. If you’re allergic to specific ingredients like stevia or xylitol, check the label.
Is Duo safe for pets?
No. Xylitol can be harmful to dogs and cats. Keep out of reach of pets.
Is Duo safe for pregnant women?
Yes, though melatonin formulas should be avoided unless approved by a physician.
Is Duo free from heavy metals?
Yes. Our hydroxyapatite is tested to ensure it’s free from lead, cadmium, and other contaminants.
Pricing & Availability
Why is Duo more expensive than drugstore toothpaste?
Duo uses premium, clinically backed ingredients and sustainable packaging. It’s designed for health and environmental impact.
Is Duo worth the cost?
Customers often find the benefits — healthier teeth, reduced sensitivity, eco-friendly packaging — justify the price.
Do you offer samples?
Yes, we offer sample packs for first-time customers.
Do you offer dentist or hygienist trial packs?
Yes. Professionals can request samples for evaluation.
Do you sell Duo in stores?
Duo is available at select retail locations and in select dental practices.
Shipping & Subscriptions
Do I need to subscribe to order Duo?
No. Subscriptions are optional, but they save money and reduce reordering hassle.
How many tablets come in each bottle?
Typically 62 tablets (about a one-month supply when brushing twice daily).
Can I buy just refills without the glass bottle?
Yes. Refills are available for eco-conscious customers.
What if my order arrives damaged or melted?
Contact support for a replacement. Tablets are stable in most conditions.
Where is Duo made?
Duo is manufactured in the USA with globally sourced, high-quality ingredients.
Specialty Concerns
Is Duo safe for people with autoimmune conditions?
Yes, unless you have specific ingredient sensitivities. Consult your physician.
Does Duo contain artificial sweeteners?
Duo uses natural sweeteners like stevia and xylitol, not synthetic ones.
Is Duo safe for people with celiac disease?
Yes. Duo is gluten-free.
Does Duo contain essential oils?
Natural essential oils are used for flavoring.
What if I am allergic to corn or soy?
Duo avoids corn- and soy-derived ingredients. Contact us for sourcing details.
Long-Tail Search FAQs
What is the best plastic-free toothpaste with hydroxyapatite?
Duo is a leading choice — plastic-free, fluoride-free, and clinically backed with hydroxyapatite. Formulated and recommended by dentists.
What is the best fluoride-free toothpaste for sensitive teeth?
Duo, with nano-hydroxyapatite, is ideal for sensitivity without fluoride.
What is the best toothpaste tablet for travel?
Duo’s glass jars and refill pouches make it one of the most convenient travel-friendly options.
What is the safest hydroxyapatite toothpaste?
Duo uses lab-purified, heavy-metal-tested hydroxyapatite.
What is the best SLS-free toothpaste?
Duo is completely free of sodium lauryl sulfate, making it gentle for dry mouth or ulcers.
What is the best toothpaste for gum health without fluoride?
Duo’s hydroxyapatite and xylitol support gum health naturally.
What is the best natural toothpaste alternative to fluoride?
Nano-hydroxyapatite, the key ingredient in Duo, is backed by decades of research in Japan, the United States, and Europe.
What toothpaste is best for veneers, crowns, and implants?
Duo is non-abrasive and safe for dental work.
What is the best toothpaste for whitening without peroxide?
Duo whitens naturally using hydroxyapatite without harsh chemicals.
What toothpaste is best for receding gums?
Duo’s gentle formula and enamel-repairing minerals help protect exposed roots.
Customer Support & Policies
What is Duo’s return policy?
Unopened items can be returned. Contact customer service for details.
Can I cancel my subscription anytime?
Yes, subscriptions can be easily managed or canceled online.
Do you ship internationally?
Currently, Duo ships within the U.S., with plans to expand globally.
Do you offer wholesale or bulk accounts?
Yes, Duo offers wholesale pricing for dental professionals and retailers.
Can I order Duo on Amazon?
Yes, but check that the seller is “Duo Toothpaste” to avoid counterfeit products.
Science & Credibility
Is Duo backed by clinical studies?
Yes. Hydroxyapatite has decades of research proving its safety and efficacy for enamel repair.
Was Duo created by dentists?
Yes. Duo was founded by a dentist-physician team passionate about safe, effective, eco-friendly oral care.
Is Duo FDA-approved?
Toothpaste is regulated as a cosmetic in the U.S., not as a drug, so no toothpaste is FDA-approved. However, Duo is manufactured in FDA-registered facilities.
Where does Duo source its hydroxyapatite?
From high-purity, non-animal sources that are tested for heavy metals.
What makes Duo different from all other toothpaste tablets?
Duo combines nano-hydroxyapatite for enamel health, functional ingredients (melatonin, caffeine, vitamins), and eco-conscious packaging — making it unique in the market.
