Synadentix Review 2026Is It Worth the Money?

What the label shows: one 400 mg proprietary blend of ten actives (guava fruit powder, hydroxyapatite, lactoferrin, lactoperoxidase, glucose oxidase, lysozyme and four other enzymes), with no amount for any of them. Even with zero filler, that averages about 40 mg per ingredient.

What the research shows: the closest match is a lactoferrin, lactoperoxidase and glucose oxidase tablet that lowered bad-breath gases 10 minutes after it was sucked. No study we found shows a swallowed tablet like this healing gums or rebuilding enamel. The hydroxyapatite evidence is for toothpaste.

Who sells it: the label names only "Synadentix" at a fulfilment warehouse in Tallmadge, Ohio. No company is identified.

Our view: at best a short-lived breath freshener at an unknown dose, sold as a dental repair treatment. Persistent bad breath or bleeding gums need a dentist.

Synadentix publishes no individual doses, so our Dose Check can only set the blend against what the studies used.

• Lactoferrin: not disclosed on the label vs 20 mg in one tablet in the breath trial. Unknown.
• Lactoperoxidase and glucose oxidase: not disclosed vs 2.6 mg each in the same trial. Unknown.
• Hydroxyapatite: not disclosed vs a toothpaste brushed on twice a day for 18 months. Different route: swallowed, not brushed on.
• Guava: fruit powder, not disclosed vs a leaf-extract mouthrinse for 30 days. Different part of the plant, taken a different way.
• Five other enzymes: not disclosed. No tablet trial to compare with.

The enzyme trio in the breath trial totalled about 25 mg, so the 400 mg blend could hold enough. But with ten ingredients sharing 400 mg and no split published, there is no way to know.

The instructions also disagree. The label says one tablet once or twice a day, held in the mouth for 30 seconds and swallowed. The sales page says let it melt under the tongue or chew it at night. The breath trials had people suck the tablet slowly, which is closer to the sales-page version.

Our Transparency Score checks five things a buyer can verify. Synadentix scores 1 out of 5.

• Label with doses: no. One 400 mg proprietary blend, no amounts.
• Identifiable company: no. "Distributed by Synadentix" at 285 Northeast Ave, Tallmadge, Ohio, which is a fulfilment warehouse that ships for many supplement brands. No legal company name.
• Refund terms in writing: yes. 90 days from delivery, in the refund policy.
• Independent testing shown: no. The support page says the facility "tests the products regularly", but no lab or certificate of analysis is shown.
• Study on the finished product: no.

Watch out for lookalikes. Synadentix is a soft tablet in bottles of 30. A third-party Amazon listing sells "SynaDentix Capsules", which is not the format on the official label. Several review pages also describe a "powder"; that is wrong too.

The sales page claims 13,451 reviews. We found no independent review platform showing anything close to that.

Prices on the official page when we checked in September 2026:

• 2 bottles: $79 each ($158), plus $9.99 shipping.
• 3 bottles: $69 each ($207), free US shipping.
• 6 bottles: $49 each ($294), free US shipping and three e-books.

A bottle holds 30 tablets: one month at one a day, two weeks at two a day.

How the refund actually works. The policy gives 90 days from delivery, but you must email a "Refund Request", send all bottles back, empty or not, to the Tallmadge warehouse, and pay the return postage yourself. Refunds take 5 to 10 days after the return arrives. The checkout is Digistore24, whose own buyer terms give a 60-day right to withdraw. To be safe, ask for a refund in writing within 60 days, quoting the order number from your confirmation email.

• Allergy: lactoferrin and lactoperoxidase are usually made from milk, and lysozyme usually from egg white. The label does not name the source, so ask the seller if you are allergic.
• Xylitol is on the label without an amount. Large amounts can cause wind or loose stools. It is also highly toxic to dogs, so store the bottle out of their reach.
• Label warning: consult a doctor if pregnant, nursing, under 18 or living with a medical condition. The support page says the product was "designed for all ages and medical conditions", which contradicts its own label.

There is no clinical study on Synadentix itself.

When to see a dentist instead: the American Dental Association notes that bad breath that will not go away can be a sign of advanced gum disease. Bleeding when brushing, gums pulling away from teeth and loose teeth all need a professional check.