Synadentix Review: Ingredients, Guarantee and How It Compares

Updated 2026-10-08 · BioBene Editorial Team

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Quick verdict: Synadentix is a bedtime chewable with saliva enzymes (lysozyme, lactoperoxidase), lactoferrin, hydroxyapatite and guava powder, backed by a 90-day refund window. The concept is plausible, but the product has no published trial and prices are hidden.

Synadentix belongs to a newer group of "saliva-support" formulas. Here is a factual look at what the official website lists and how it holds up.

What is Synadentix?

Synadentix is a chewable supplement that the official page says is designed to support the oral microbiome. The brand recommends letting one tablet melt under the tongue, or chewing it slowly, at night before bed. The pitch centers on saliva: saliva naturally contains antibacterial proteins and minerals, and the formula includes versions of several of them.

What's inside Synadentix, according to the official website?

The text page lists ten ingredients in a proprietary blend:

1. Guava fruit powder
2. Microcrystalline hydroxyapatite complex
3. Beta-glucanase
4. Dextranase
5. Amylase
6. Lactoperoxidase
7. Glucose oxidase
8. Amyloglucosidase
9. Lysozyme
10. Lactoferrin

No amounts are listed. Lactoferrin and lactoperoxidase are usually derived from milk, so people with a milk-protein allergy should check the label.

What does research say about Synadentix's main ingredients?

• Salivary proteins: lysozyme, lactoferrin and the lactoperoxidase system are part of the mouth's natural defenses. A 2019 review in the Journal of Dentistry describes how these proteins help keep oral microbes in balance. That supports the concept, not the product: there is no published evidence that swallowing or chewing a tablet raises their levels in a meaningful way.
• Hydroxyapatite: a 2024 systematic review found evidence that hydroxyapatite in toothpastes, mouthwashes and gels can help against caries; some authors work for an oral-care company. A 2025 commentary asked whether that evidence is strong enough to recommend. Either way, those studies are on products applied to teeth, not chewables.
• Dextranase and other enzymes: these break down sugars and the sticky matrix of plaque in lab settings. Human data for a supplement are lacking.

The official FAQ also claims the ingredients "go directly into your bloodstream" and detox the whole body. That is a marketing claim without support; we do not repeat it as fact.

Is Synadentix better than a hydroxyapatite toothpaste?

They do different things, and the evidence favors the toothpaste. Hydroxyapatite research, including the 2024 systematic review, involves products brushed or rinsed directly onto teeth. A chewable that dissolves under the tongue delivers an unknown amount of hydroxyapatite for a short time. If hydroxyapatite is the ingredient that drew you to Synadentix, a toothpaste containing it, used alongside or as advised by your dentist, is the better-studied option. Note that hydroxyapatite toothpastes are often fluoride-free; ask your dentist whether that suits your cavity risk.

Check Synadentix on the official website

How much does Synadentix cost?

The order section offers 2 bottles, 2 + 1 bottles and 3 + 3 bottles. The dollar totals are loaded by a script and are not in the page text, so we could not verify them; check the current price on the official website. In text, the page states:

• $9.99 shipping on the 2-bottle package, free shipping on the larger ones.
• Three digital bonus guides with the 6-bottle order.
• A one-off purchase with no auto-ship.

What is the Synadentix refund policy?

The sales page and the refund page both state a 90-day money-back guarantee. The refund page says the 90 days start on delivery and asks you to return all bottles with the packing slip. It also suggests using the product for at least three months before deciding, which leaves little margin inside a 90-day window.

Who might Synadentix suit?

• People interested in the saliva-protein approach.
• Those who like a once-a-night routine.
• Buyers who want a slightly longer refund window than the usual 60 days.

Who should not use Synadentix without advice?

• Anyone with a milk allergy (lactoferrin and lactoperoxidase are typically milk-derived; confirm on the label).
• Pregnant or breastfeeding women and children under 18.
• Anyone taking medicines or managing a chronic illness.
• Anyone with signs of gum disease. The sales page names a gum-disease bacterium as the "real problem"; if gum disease is the worry, a dentist can diagnose and treat it.

What should you ask before ordering Synadentix?

• How much lactoferrin and hydroxyapatite is in each tablet?
• What is the source of the lactoferrin and enzymes (milk, microbial, other)?
• Is the product third-party tested for purity?
• Does the 90-day clock start on delivery or shipping? (The refund page says delivery.)

The footer of the official page links to product support for these questions.

What are the weaknesses of Synadentix?

• Proprietary blend with no amounts.
• Unsupported claims about bloodstream detox and protecting the brain.
• Prices hidden from the text version of the page.
• Refund requires returning all bottles and the packing slip.

Synadentix vs DentaTonic

DentaTonic lists seven of the same ingredients (it lacks guava, glucose oxidase and amyloglucosidase) and is taken with water rather than dissolved at night. Synadentix offers 90 days; DentaTonic offers 60. Full breakdown: Synadentix vs DentaTonic.

How to get the most from any night-time oral routine

Brush with fluoride toothpaste before bed and clean between your teeth. Saliva flow drops during sleep, so the NIDCR advice on dry mouth, such as sipping water and avoiding tobacco and alcohol, is relevant if you wake with a dry mouth.

See Synadentix packages

Sources consulted: pubmed.ncbi.nlm.nih.gov, nidcr.nih.gov.