Dextranase
EVIDENCE: WEAKAlso sold as: α-1,6-glucan hydrolase, dextranase enzyme, DexA
Dextranase breaks down dextran, part of the structure in S. mutans plaque. Older human mouthrinse trials had mixed results, and modern laboratory studies support the proposed mechanism. No contemporary supplement trial was identified.
Compiled by iSupplementReviews editorial team ·Updated 2026-10-06 · 4 sources
- Type
- Enzyme — biofilm matrix degrader
- Studied dose
- Historical mouthrinse trials used activity-unit dosing 2–3×/day; no supplement-dose established
- Best form
- Topical contact form (rinse/dissolving tablet) — it's an enzyme that works on contact with biofilm, not in the bloodstream
- Our rating
- WEAK — Mostly small, animal, or traditional evidence
What is dextranase?
Dextranase is an enzyme that breaks down dextran, a sugar-chain structure in plaque made by S. mutans. The bacteria form dextran from sucrose. Breaking those bonds is a plausible way to weaken plaque structure, supported by laboratory work.
Other names and forms it’s sold as
- α-1,6-glucan hydrolase / DexA / DexA70: systematic and fragment names in the literature
- Sugar-refinery dextranase: same enzyme used industrially to clear dextran blockages in sugar mills; purity grade differs
- Enzyme dentifrice/lozenge component: always bundled with the broader enzyme set, never sold alone
What is it claimed to do?
Dissolve plaque biofilm, prevent bacterial adhesion, “deep clean” tooth surfaces. The matrix-degradation claim is real biochemistry; whether a given product delivers active enzyme to the biofilm is the open variable.
What does the research show?
| Claim | Evidence | Dose studied | Verdict |
|---|---|---|---|
| Disrupts S. mutans biofilm | Modern lab studies confirm matrix disruption (DexA70 fragment, 2021) | laboratory | Supported (lab) |
| Reduces plaque in humans | 1970s mouthrinse trials: some positive, some null — mixed legacy evidence | Activity-unit rinses | Weak/mixed human data |
| Prevents cavities | Never tested as an outcome | — | Unproven |
| Works as swallowed supplement | Contact-based mechanism — no systemic route | — | Implausible format |
The oldest idea in the formula
Older human trials produced mixed dextranase results. The concept works mechanically but biofilm in a real mouth reforms fast and the enzyme doesn’t stick around. Modern interest revived because we now understand the biofilm matrix better, but no modern human trial has re-run the experiment in supplement form.
What dose was studied?
| Goal | Dose | Form/route | Duration |
|---|---|---|---|
| Plaque reduction (historical) | Activity-unit dextranase | Mouthrinse 2–3×/day | Days–weeks |
| Biofilm disruption (lab) | DexA70 fragment | Lab biofilm model | Hours |
Side effects
None documented; non-toxic catalytic enzyme, decades of industrial use.
Drug interactions
None documented.
Who should not take it?
No established exclusions.
What the authorities say
Unassessed by any regulator for dental claims. Legal as an enzyme ingredient; benefits unverified by institutions.
What to know about dextranase
Dextranase has laboratory plaque evidence and older mouthrinse trials with mixed results. No modern trial identified here establishes benefit from a chewable supplement. Dose, contact time, and repeated exposure remain relevant uncertainties.
Frequently asked questions about Dextranase
What does dextranase do for teeth?
Streptococcus mutans, the primary cavity bacterium, builds its biofilm home from a glucose polymer called dextran. Dextranase is the enzyme that cuts the α-1,6 bonds in that polymer, dissolving the scaffolding the biofilm hangs on. It's the most direct 'anti-plaque' mechanism any enzyme has.
Is there human evidence for dextranase?
Yes but it's fifty years old and mixed: 1970s mouthrinse trials reported plaque reductions in some studies and nulls in others. Modern work (including a 2021 Frontiers study on the DexA70 dextranase fragment) keeps confirming it disrupts S. mutans biofilm in lab models: mechanism solid, contemporary human outcomes unmeasured.
Does it kill bacteria?
No; it's not antimicrobial, it's structural. It dissolves the matrix, which makes the bacteria inside lose their anchor and become reachable by saliva and brushing. Think demolition crew, not police.
Does swallowed dextranase work?
The mechanism is contact-based: the enzyme must physically reach the biofilm surface. A tablet dissolved in the mouth gives contact; a swallowed capsule gives none. Formulation format is everything for this ingredient.
Is dextranase safe?
It's a non-toxic food-industry enzyme (used in sugar refining to break down dextran gunk) with a clean safety history. No meaningful adverse profile at the catalytic amounts oral products use.
References
- [1]DexA70 dextranase effectively disrupts S. mutans biofilm (Front Microbiol 2021)
- [2]Lactoperoxidase-system and enzyme oral care — mechanism review (Int J Mol Sci 2019)
- [3]Enzyme dentifrice (enzymes+proteins) improved gingival health — 3-month RCT (J Dent 2019)
- [4]Clinical study of a dextranase mouthwash on plaque — historical human trial series (J Periodontol)
Products we reviewed containing Dextranase
Based on recorded labels or seller-described formulas. Inclusion does not establish a match to the strains, preparations or amounts studied here; check each review's disclosure limits.