DAILY ORAL PROBIOTIC

Fresh breath that compounds, not fades.

Stays fresh hour after hour. Healthier teeth and gums in 8 weeks.

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40+ PUBLISHED CLINICAL STUDIES
Fenn Method daily oral probiotic.
Scanning electron micrograph of Streptococcus salivarius K12, the probiotic strain in every Fenn Method mint, colorized in the brand deep sage palette.
Streptococcus salivarius K12 · SEM, 0.5 μm
THE FORMULATION

Designed for the long game.

Four actives, each doing a specific job. Two probiotic strains build the long-term shift. 550mg xylitol starves the bad bacteria. 3mg zinc citrate for an immediate freshening step.

WHY A DAILY PROBIOTIC

Most oral care wears off in hours.

Toothpaste, mouthwash, mints all start a fresh-breath timer the second you use them. Then it runs out.

Fenn Method works on the root cause: the bacteria behind bad breath and plaque. Over time, the probiotic strains colonize your oral microbiome and crowd them out.

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$35.99/mo · cancel anytime

WHAT IT BUILDS OVER TIME

Three outcomes that compound over time.

Fresh breath that lasts.

Designed around the strain studied for reducing the compounds that cause bad breath. Not a 30-minute mask.

Healthier teeth and gums.*

The other strain is studied for reducing plaque build-up and supporting healthy teeth and gums. Built for long-term use.

A balanced oral microbiome.*

Two clinically studied probiotic strains plus xylitol at an effective dose that supports fresh breath and gum health. Built to work with your mouth, not against it.

PEER-REVIEWED RESEARCH

Fewer plaque-forming bacteria.

Fenn Method works by colonizing the surfaces in your mouth where cavity-forming bacteria would settle. They're crowded out, and biofilm formation drops. What's visible at 72 hours compounds over weeks of daily use.
Scanning electron microscope comparison: same tooth-like surface with cavity-causing bacteria after 72 hours, without Fenn Method on the left and with Fenn Method on the right.
Cavity-causing bacteria after 72 hours. Left: without Fenn Method. Right: with Fenn Method.

Reichardt et al. (2024). Journal of Oral Microbiology. CC BY 4.0.

Fenn Method
A small Fenn Method travel jar resting in an open palm, on cream linen.
INCLUDED
A pocket-sized travel jar, with your first order.
Fenn Method Supplement Facts label
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Fenn Method
Oral Probiotic

A clinically studied probiotic for fresh breath, healthier teeth and gums, and a balanced oral microbiome.*

$35.99/moCLINICALLY STUDIED

30-day supply, delivered monthly. About $1.20 per day. Pause or cancel anytime.

30-day money-back guarantee · Ships free
  • Third-party tested for purity and potency
  • Made in the USA at a cGMP facility
  • No artificial colors or sweeteners
  • Cancel anytime, no lock-in

Benefits

  • 01 Fresh breath that compounds, not fades.
  • 02 Healthier teeth and gums over time.
  • 03 A balanced oral microbiome that crowds out the bacteria behind bad breath.
  • 04 Pocket-size travel jar included with your first order.

Free shipping on every order. Pause, skip, or cancel anytime in your account. 30-day money-back guarantee on your first kit.

PEER-REVIEWED RESEARCH
85%

Of participants in the Burton 2006 study saw substantial reductions in compounds that cause bad breath after 7 days of use.

Burton et al. 2006, Journal of Applied Microbiology See the research →

Fenn Method's active strains are backed by 40+ published clinical studies.

*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

HOW IT COMPARES

What sets Fenn Method apart.

OURS
Fenn Method
CATEGORY
Other oral probiotics
CATEGORY
Antiseptic mouthwash
Active probiotics per mint 2 billion CFU in one mint (1B K12 + 1B M18) Big CFU claims, often counted across a multi-tablet serving No probiotics
Xylitol at an effective dose 550mg per mint Trace amounts, if any None
Zinc citrate for instant freshening 3mg per mint Almost never included None
How it treats your mouth Adds good bacteria, crowds out the bad Also adds good bacteria Kills bacteria, good and bad
FENN METHOD

Fenn Method

Active probiotics per mint
2 billion CFU in one mint (1B K12 + 1B M18)
Xylitol at an effective dose
550mg per mint
Zinc citrate for instant freshening
3mg per mint
How it treats your mouth
Adds good bacteria, crowds out the bad
COMPARATOR

Other oral probiotics

Active probiotics per mint
Big CFU claims, often counted across a multi-tablet serving
Xylitol at an effective dose
Trace amounts, if any
Zinc citrate for instant freshening
Almost never included
How it treats your mouth
Also adds good bacteria
COMPARATOR

Antiseptic mouthwash

Active probiotics per mint
No probiotics
Xylitol at an effective dose
None
Zinc citrate for instant freshening
None
How it treats your mouth
Kills bacteria, good and bad
WHAT'S INSIDE

Four actives. Every one earns its place.

Two probiotic strains for the long game, 550mg of xylitol that bacteria can't feed on, and zinc citrate for an immediate freshening step.*

01

S. salivarius K12.

1 billion CFU per oral probiotic mint. Studied for reducing the compounds that cause bad breath. Cited in published clinical research. *

Details →
02

S. salivarius M18.

1 billion CFU per oral probiotic mint. Helps support healthy teeth and gums.* *

Details →
03

Xylitol.

550mg per oral probiotic mint. Bacteria try to metabolize it and cannot. The dose oral health researchers actually recommend after brushing.

Details →
04

Zinc citrate.

3mg per oral probiotic mint. Adds an immediate freshening step while the strains do the longer-term work. *

Details →
A small Fenn Method travel jar resting in an open palm, on cream linen.
INCLUDED WITH YOUR FIRST ORDER

A pocket-sized travel jar.

Daily oral care doesn't work if you only do it at home. Your first order includes a pocket-sized travel jar so the routine moves with you on commutes, trips, and mornings away from your bathroom. Ships free.

WHAT TO EXPECT

Fresher breath in a week. Healthier teeth and gums in 8.

  1. WEEK 1

    Fresher breath

    • 85% saw substantial reductions in compounds behind bad breath (1)
    • Visible reduction in plaque-forming biofilm within 72 hours (2)
    • Less morning breath, fresher between meals
  2. WEEK 4

    Less plaque

    • Helps decrease build-up of dental plaque (*)
    • M18 strain colonization established in your oral microbiome
  3. WEEK 8

    Healthier gums

    • Supports healthy teeth and gums (*)
    • The microbiome shift holds with continued daily use
How to Use:

Take 1 mint daily. Place on tongue, let it dissolve. Wait 30 minutes before eating or drinking.

FREQUENTLY ASKED

Common questions.

Q.01 How does the subscription work?
A 30-day supply of Fenn Method ships to you monthly at $35.99 per month. You can skip a shipment, delay it, or cancel at any time through your account. We do not lock you in. After your first kit arrives, you have 30 days to try it. If you do not love it, return it for a full refund. We cover return shipping.
Q.02 When will it ship?
Orders ship in 3-5 business days via standard shipping (included free). You receive a tracking number by email once your kit is on its way. Your subscription continues monthly from the date your first kit ships.
Q.03 Is Fenn Method for me?
Fenn Method is for people building a daily oral care routine for the long game. The effect compounds over 4 to 8 weeks of consistent use. If you want a per-use mint to mask breath before a meeting, this isn't it. If you want fresh breath that holds and healthier teeth and gums that build over time, this is the right fit.
Q.04 Why is it $35.99 a month?
Four things. (1) 550mg of xylitol per oral probiotic mint, printed on the label. Most products use trace amounts or do not disclose at all. (2) Two clinically studied probiotic strains paired together (K12 and M18), not a single strain. (3) Zinc citrate for an added freshening step the probiotic strains cannot deliver on their own. (4) Every claim on this site links to a peer-reviewed study. The math: $35.99 a month is about $1.20 a day. Less than a single dental cleaning.
Q.05 How is this different from breath mints?
Standard mints mask odor with flavor. Fenn Method does something different. Zinc citrate adds an immediate freshening step, while clinically studied strains (K12 and M18) and 550mg of disclosed xylitol support your oral microbiome over time.*
Q.06 Does it interact with mouthwash or toothpaste?
Toothpaste is fine. Antiseptic mouthwash with chlorhexidine or strong alcohol can inhibit the probiotic strains; if that is in your routine, take the oral probiotic at a different time of day.
Q.07 Is it safe to take every night?
Yes. The ingredients are well-studied for daily use. Xylitol at our dose is well within established safe ranges. If you are pregnant, nursing, or taking medication, check with your dentist or doctor.
Q.08 Can I cancel my subscription anytime?
Yes. Cancel, skip, or delay anytime in your account. No lock-in, no questions, no friction.
Q.09 What if I receive the kit and don't like it?
30 days from delivery to try it. If it's not for you, return it for a full refund. We cover return shipping.
STAY CLOSE

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REFERENCES
  1. (1) Burton, J.P. et al. 2006. A preliminary study of the effect of probiotic Streptococcus salivarius K12 on oral malodour parameters. Journal of Applied Microbiology. pubmed.ncbi.nlm.nih.gov/16553730
  2. (2) Reichardt, J. et al. 2024. Probiotic strains and oral biofilm formation on hydroxyapatite. Journal of Oral Microbiology. pmc.ncbi.nlm.nih.gov/articles/PMC10823884

(*) Structure/function claim based on M18 strain research. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

Fenn Method · Daily Oral Probiotic
$35.99/MO · CANCEL ANYTIME · SHIPS FREE