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DIFINEY 4.0 box and mouthpiece; nasal strips work on the nose only, DIFINEY supports your jaw

4.7/5 · 521 Reviews

STILL SNORING?

YOUR NOSE MAY NOT
BE THE PROBLEM.

Unlike nasal strips, DIFINEY gently moves your jaw forward to help open your airway.

OCTOBERSALE

DIFINEY 4.0 2-pack with two retail boxes and the clear mouthpiece

BEST VALUE

Regular price$119.96

Sale price$87.98for 2

+ 3 FREE GIFTSCleaner + 2 Cases

CLAIM MY $111.94 SAVINGS

Low stock — selling fast

FREE U.S. Shipping

90-Night Money-Back

DENTIST RECOMMENDED

Dr. Derek M. Cornetta · DDS, FAGD

Dr. Cornetta signature
Dr. Derek M. Cornetta, DDS, FAGD
01

Here’s Why Nasal StripsDidn’t Work.

When you fall asleep, your lower jaw can relax backward, narrowing the space behind your tongue where snoring vibration begins.

Nasal strips only target your nose. DIFINEY gently holds your lower jaw forward, creating more room for airflow and helping reduce the vibration behind snoring.

Sleep Specialist Reviewed

“Gently advances the jaw to support airflow and nighttime comfort.”

Emmett Lynch

Adult sleep and snoring specialist

Emmett Lynch
Jaw back narrows the airway; DIFINEY holds the jaw forward for more room for air
02

You Didn’t Choose to Snore.But It’s Costing You Both Sleep.

One of you snores. The other lies awake or moves to the couch. By morning, you’re both tired.

But you don’t have to accept this as normal.

A man carrying his pillow out of the bedroom at night
03

Your Jaw Isn’t One‑Size‑Fits‑All.Your Mouthpiece Shouldn’t Be Either.

A fixed setting may move your jaw too little or too far forward.

DIFINEY gives you 1 to 6 mm of adjustment. Start at just 1 mm, then move forward gradually with your thumb until you find the lowest comfortable setting that helps reduce your snoring.

No tools needed. Just adjust it with your thumb.

04

60 Seconds.Made to Stay Put All Night.

DIFINEY softens in boiling water and molds around your upper and lower teeth. Your tooth impressions create a closer, more secure hold.

90%

reported a more comfortable and secure fit*

Compared with an unmolded mouthpiece.

*Based on an internal customer survey comparing molded vs. unmolded mouthpieces. Individual results may vary.

Mold It at Home in Minutes

4 simple steps

  1. 1

    HEAT

    40 sec

    Soften it in boiling water.

  2. 2

    BITE

    10 sec

    Bite down firmly to mold it to your teeth.

  3. 3

    COOL

    30 sec

    Dip it in cool water to lock the shape.

    ⚠ Then dry it — it MUST be 100% dry.

  4. 4
    WEAR

    WEAR

    Adjust your setting and go to sleep.

First fit not quite right? Reheat and remold up to 3 times.

05

Comfortable Enough to Wear All Night?DIFINEY Customers Say Yes.

A mouthpiece only works if you can comfortably keep it in throughout the night. Here is what DIFINEY customers say:

DIFINEY customers holding their mouthpieces

Lydia L.

✓ Verified Purchase

★★★★★

Easy to use

“Kind of just feels like you’re wearing a retainer. It doesn’t feel uncomfortable or gag inducing at all.”

Omarious

✓ Verified Purchase

★★★★★

Comfy enough to wear all night

“After little tweaking, the adjustable fit is fantastic and comfy enough to wear all night... my snoring has changed from freight train to calm breeze. I wake up feeling more rested too.”

Whitney

✓ Verified Purchase

★★★★★

Game-changer for better sleep

“It’s comfortable to wear, easy to adjust, and most importantly, it works! My partner says I barely snore anymore, and I wake up feeling so much more rested.”

Review excerpts. Individual results vary.

06

You Wear It for Hours.DIFINEY Is FDA‑Cleared and BPA‑Free.

Physician-recommended
FDA Cleared
BPA Free

Dentist Recommended

Dr. Derek M Cornetta

DDS, FAGD

Dr. Derek M Cornetta

DIFINEY 4.0 is an FDA-cleared over-the-counter anti-snoring mouthpiece made with BPA-free materials. Its design has also been reviewed by dental and sleep professionals.

07

Try It for 90 Nights.Money Back Even After You Mold It.

If your partner doesn’t notice quieter nights, request a refund within 90 days of delivery — EVEN AFTER MOLDING.

You do not have to decide from a product photo. You can decide after trying it.

Free U.S. Shipping · 90-Day Money-Back Guarantee

DIFINEY Assurance 90-day money-back guarantee
BEST SELLER 4.7 521 reviews

Difiney 4.0: Stop Snoring with a Custom Fit You Can Adjust®

Difiney 4.0 adjusts to you. It guides your jaw forward to keep your airway open. Built to silence snoring.

“It’s so comfortable, you’ll barely notice it’s there.”

BUNDLE & SAVE

DIFINEY 4.0 · 2 Devices

$43.99/per device$59.98

Total$87.98

  • Free U.S. Shipping
  • FDA Cleared
  • BPA-Free

🎁 OCTOBER SALE 🎁

The more you buy, the more you unlock

  • FREE $6.99 Free U.S.
    Shipping
  • FREE $19.99 1 Protective
    Case
  • FREE $19.99 2 Protective
    Case
  • FREE $19.99 3 Protective
    Case
  • FREE $39.98 Ultrasonic
    Cleaner

90-Day Money-Back Guarantee

Not happy? Get a full refund — even after molding.

Secure Checkout

Why 200,000 Customers Choose DIFINEY

Real stories from customers who found quieter, more comfortable sleep.

★★★★★
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DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5 - 1 Device $49.98 $59.98

★★★★★
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DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5 - 1 Device $49.98 $59.98

★★★★★
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DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5 - 1 Device $49.98 $59.98

★★★★★
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DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5 - 1 Device $49.98 $59.98

★★★★★
0:00 / 0:00
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5 - 1 Device $49.98 $59.98

★★★★★
0:00 / 0:00
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5 - 1 Device $49.98 $59.98

★★★★★
0:00 / 0:00
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5 - 1 Device $49.98 $59.98

★★★★★
0:00 / 0:00
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5
DIFINEY 4.0 Advanced Anti Snoring Mouthpiece-v5 - 1 Device $49.98 $59.98

What DIFINEYUsers Say.

4.7

521 reviews

5 ★ 438
4 ★ 47
3 ★ 17
2 ★ 12
1 ★ 7

Whitney

Verified Purchase

★★★★★ 1 year ago

Game-changer for better sleep

I was honestly skeptical at first, but the Difiney Advanced Anti-Snoring Device 4.0 has completely exceeded my expectations. After trying several other solutions with no real results, this device finally delivered. It’s comfortable to wear, easy to adjust, and most importantly, it works — my partner says I barely snore anymore.

Photo from Whitney

Mike

Verified Purchase

★★★★★ 10 months ago

Im alive !!!

My wife doesn’t want to murder me anymore. Its great!!!! In all seriousness im actually sleeping much better and waking up feeling way more refreshed.

Robert P.

Verified Purchase

★★★★★ 1 year ago

Effective item

I had the snoring issues from long time and tried several things but didn’t get much help. Then I ordered this device and it helped me a lot. After using it for a while and seeing how effective it is, I recommended it to my family and friends.

Photo from Robert P.

Kaylee V.

Verified Purchase

★★★★★ 12 months ago

Get better airflow and stop grinding teeth

This mouth guard designed to reduce snoring is very effective and easy to boil to fit custom to your mouth. This design created a barrier between the upper and lower teeth helping to prevent grinding and reduce damage. The positioning of the jaw promotes better airflow.

Photo from Kaylee V.

Frequently Asked Questions

Fit, Adjustment, Results, Shipping & More.

What's the difference between DIFINEY 2.0 and DIFINEY 4.0?

Both DIFINEY 2.0 and DIFINEY 4.0 use a boil-and-bite process to create a custom fit. The main differences are their profile, adjustment rail, adjustment range and molding material.

Profile: DIFINEY 4.0 has a more compact shape without the protruding side section of the original 2.0 design, giving it a less bulky profile.

Adjustment rail: DIFINEY 4.0 uses a redesigned rail for smoother sliding when adjusting the jaw position. DIFINEY 2.0 uses the original rail design.

Adjustment range: DIFINEY 2.0 adjusts from 1–4 mm, while DIFINEY 4.0 adjusts from 1–6 mm. The 4.0 range extends 2 mm further, giving you more room to personalize your setting.

Molding material: DIFINEY 4.0 uses an upgraded heat-moldable material designed to fit more closely to your teeth and bite. DIFINEY 2.0 uses the original molding material.

Both models require molding to your teeth. Follow the fitting and adjustment instructions for the model you choose.

Do anti-snoring mouthpieces actually work?

They can, depending on what is causing the snoring. Mandibular advancement mouthpieces hold the lower jaw slightly forward while you sleep. That can create more room in the upper airway and reduce the tissue vibration that makes the snoring sound. Oral appliances are an established option for adult primary snoring, but no single solution works for every type of snoring.

How does moving the lower jaw forward help reduce snoring?

When you fall asleep, the muscles around your tongue and throat relax. In some people, that makes the airway narrower. Holding the lower jaw slightly forward can create more space behind the tongue, so air moves through with less turbulence and less soft-tissue vibration. That is the basic idea behind mandibular advancement devices such as DIFINEY.

Does snoring mean I have sleep apnea?

No. Plenty of people snore without having sleep apnea. But loud, frequent snoring can also be a sign of obstructive sleep apnea, especially if it comes with breathing pauses, gasping or choking, morning headaches, or strong daytime sleepiness. If you notice those signs, it is worth getting checked by a healthcare professional.

Can DIFINEY treat sleep apnea?

No. DIFINEY 4.0 is designed to help reduce snoring. It is not intended to diagnose, treat, or cure sleep apnea. If you think you may have obstructive sleep apnea, get evaluated rather than assuming an over-the-counter snoring mouthpiece is enough. Oral appliances can be used clinically for some people with diagnosed OSA, but that is a separate treatment pathway with professional diagnosis and follow-up.

What if I'm still snoring while wearing DIFINEY?

First, check the fit and make sure the device is sitting securely. Then give your current adjustment a few nights if it still feels comfortable. If snoring continues, you can increase the advancement gradually according to the adjustment guide. Do not jump straight to the maximum setting. Congestion, alcohol, sleep position, weight changes, and other airway factors can also affect snoring. If snoring stays loud or comes with breathing pauses or gasping, talk with a healthcare professional.

Ready forQuieter Nights?

Mold it to your teeth. Adjust it with your thumb. Decide in 90 days.

OCTOBERSALE

DIFINEY 4.0 2-pack with two retail boxes and the clear mouthpiece

BEST VALUE

Regular price$119.96

Sale price$87.98for 2

+ 3 FREE GIFTSCleaner + 2 Cases

CLAIM MY $111.94 SAVINGS

Low stock — selling fast

FREE U.S. Shipping

90-Night Money-Back

90-Day Money-Back Guarantee

DIFINEY 4.0 Anti-Snoring Mouthpiece

4.7 · 521 Reviews