Frequently Asked Questions

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SleepTight Mouthpiece STZ Help

Customer Service

Technical Professional


How do I know the STZ will work?

The mouthpiece solution for snoring has been medically validated. The American Academy of Sleep Medicine, American Academy of Family Physicians, the American Academy of Dental Sleep Medicine and the scientific journal "Sleep and Breathing" all recommend the use of a mouthpiece for the treatment of snoring.

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How does the STZ work?

  • The STZ holds your jaw forward during sleep to open the airway and improve snoring. The most common cause of snoring is air being passed through a partially constricted airway causing vibration of the palate during breathing.
  • The STZ front opening also allows for gentle tongue retention while the jaw is help forward. This also improves removes airway obstruction to improve snoring.

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Is there a warranty?

Yes. You have 30 days from the date your order is shipped to qualify for a refund. Contact us at orders@SleepTightMouthpiece.com for return information.

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Can the SleepTight Mouthpiece be used with dentures, caps, crowns, veneers or fixed bridges?

  • No. SleepTight Mouthpiece product is recommended for people with a complete full denture in one or both dental arches. The STZ requires at least 4 teeth in both the upper and lower dental arches to hold the mouthpiece in and the lower jaw forward. The device is most effective if there are front teeth present. A tongue retaining device in some cases will help denture wearers.
  • The STZ is safe to use on well cemented permanent restorations such as caps, crowns, veneers and fixed (not removable) bridges.
  • Loose teeth and recently placed dental implants should not be used as supporting teeth for the SleepTight Mouthpiece.
  • Please consult with your dentist, if you have questions about the suitability of the SleepTight Mouthpiece for your particular situation.

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What is the texture like with the STZ?

The SleepTight Mouthpiece STZ texture remains smooth after multiple fitting increasing user comfort as compared the original SleepTight Mouthpiece. With the original STZ, not following the directions and overheating the water during fitting resulted in a rough texture.

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Does the STZ come in sizes?

The STZ is currently available in one size. But the custom-fit feature allows it to fit almost every user. The bulk of the original STM has been reduced making the new STZ much more comfortable.

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Will I be able to breathe through my mouth or swallow with the STZ?

  • Yes. The STZ has been engineered with large breathing holes to allow you to breathe easily. This is particularly helpful for mouth breathers. This is also helpful for those with nasal obstruction caused from allergies, structural abnormalities, sinus infections, excess alcohol consumption or other blockage causes.
  • You can swallow normally with the STZ. Unlike other mouthpieces, the STZ does not squeeze your tongue in a bulb or hold it down with rubber bands.

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What should I do if my snoring does not improve?

If you have performed the self-help steps above and you have not seen improvement, you may want to contact your medical provider for additional help.

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Is there a simple test to try before purchasing the STZ?

  • Yes. You can try this. Close your mouth with your teeth together. Then try to make a snoring sound.
  • Then open your mouth a little and move your jaw forward a little at a time and try to make the snoring sound. You will see that the snoring improves. This opening and jaw forward movement is how the mouthpiece alleviates your snoring.
  • The STZ mouthpiece holds the jaw in that location while you sleep.

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How do I use the STZ?

  • Simply place the STZ in your mouth
  • Close into the pre-fitted teeth imprints
  • Position your tongue forward into the airway opening. This positioning allows for gentle retention of the tongue to help open the airway and reduce snoring and help sleep apnea. If you wake up place the tongue back into the airway space unless you have some nasal obstruction.

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When will the snoring improve?

  • For most people you will know the first night, if your snoring improves. If your snoring is better even for a short while, then you know that the mouthpiece is helping.
  • Refitting the jaw more forward after a few days may also help improve your snoring. If you do not see improvement, you may want to contact your medical-dental provider for other treatment options.

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How long does it take to get used to it?

  • Within a few nights. The adjustment phase obviously varies from person to person. Usually within a week or two most of the side effects have diminished or disappeared.
  • We recommend using the STZ for at least 5 nights before making any adjustments.

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How long will the STZ last?

  • There are many factors that can affect the life expectancy of your STZ, and this will vary from person to person. Grinding or clenching your teeth while you sleep, how clean you keep it, and how you store it will all play a part.
  • More than half of our customers who reorder do so after 6-12 months of use, while others have used their SleepTight Mouthpiece up to 3 years before replacement.

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How is the STZ cleaned or stored?

  • Everyday rinse with cool running water and a small amount of liquid anti-bacterial soap. Never use hot water. If debris remains, you can use a very soft toothbrush or cotton swab.
  • Avoid toothpastes containing abrasives which can damage the soft STZ surface over time causing it to be more susceptible to staining. Never use bleach, alcohol or other strong chemicals.
  • Weekly soaking the appliance with the approved oral appliance cleaner can help with staining, freshness and kill harmful bacteria. Contact info@sleeptightmouthpiece.com for our current recommendation.
  • Store the device in a cool dry location in its container.
  • Always brush your teeth in the evening before inserting the STZ.

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Will the mouthpiece cause gagging?

Rarely. Customers rarely mention gagging. If you experience this problem, wear the STZ for a few minutes at a time during the day until the body adjusts to having something in your mouth.

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Why do I have extra saliva?

  • Saliva accumulation will decrease. The body initially interprets the mouthpiece as a food type material which requires saliva. This is common and dissipates over time.
  • Solutions: Wear the device during the day will often speed the process of adjustment. Sucking on sugarless candy will also speed the adjustment as you unconsciously remove the temporary saliva increase. Refit the device to improve the border seal. Pay particular attention to compression along the sides.

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How do I fit the STZ?

Download the PDF instructions: User Guide PDF



See: the resources section for more details.

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Why do I see a charge on my card for more than the trial amount?

This is a question that comes up occasionally with our customers. In order to prevent fraud, we authorize the full amount for our product to ensure our customer is capable of paying us if they like our product. Unfortunately, some credit card companies show these authorizations as charges.

Once the product is shipped, we capture only the trial amount. The remaining authorized amount will then be removed, this process can take around 7 days. After the trial period, we charge the remaining amount. We are using Stripe for our payments, you can read more about this process: here.

We apologize for any inconvenience you may have. We must protect ourselves as a merchant from fraud, which is common in e-commerce. In summary, all you were seeing on your statement was an authorization and not a captured charge.

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I am not based in the United States, how can I order STM?

You can buy STM internationally: here.

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I didn’t get to try the mouthpiece until now, can I still return it after the trial period?

Unfortunately, we cannot process your request for a refund. Please review the terms and conditions on our website which you agreed to at the time of purchase.

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When will I receive my order?

Orders are sent out within 72-hours of the time they are placed. This excludes holidays and weekends. To see the current status of you order, go to the order status page.

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Can the STZ be used any other way?

Currently, the STZ is indicated for the treatment of snoring only.

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Can the STZ be adjusted to be more effective and improve my snoring?

  • Yes. Refit “Tweak” the mouthpiece If not initially successful, most people can see an improvement in their snoring by simply tweaking the STZ mouthpiece.
  • The STZ initial fit, positions the lower jaw slightly forward which in many cases will be enough to improve your snoring. This initial location also helps reduce side effects of tooth and jaw discomfort.
  • If after at least 5 nights of use, you want more improvement, you can refit the STZ according to the initial fitting instructions. Work in front of a mirror again. Secure the fitting handle by clicking the parts back together inside the mouthpiece opening. Bite into the pre-fit tooth imprints that you made before and then while the material is soft move the jaw forward slightly. You will see the fitting handle move upward slightly. Compress as before. This can be repeated a few times if necessary and you are likely to be able to get another 2-3mm of advancement depending on your anatomy.
  • Often just keeping the tongue forward will improve your snoring and breathing. Position your tongue forward into the front of the mouthpiece. You will note a gentle suction effect on the tongue as it is being held forward to keep the airway open and improve snoring and sleep apnea. Unlike other snoring devices, the STZ does not suction the tongue with a bulb nor strap it down with rubber bands. With the STZ you have free tongue movement and can swallow normally, which is important while sleeping.

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What can I do about my dry mouth?

  • Use a mouth lubricant such as Biotene Spray
  • The good news is that the Sleep Tight is working to open the airway. But, because you are not breathing thru your nose, the mouth dries out. You could have a nasal obstruction which forces you to breathe thru your mouth which may require and additional dental or medical evaluation.

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How can I keep my mouthpiece in because it falls out?

  • This is usually caused from a poor initial fitting process.
  • Nighttime clenching and grinding can stretch and loosen the mouthpiece too. The STZ was engineered to with a dual laminate design to help resist this stretching.
  • You can improve the retention by using one or more of the following steps.
  • Refit the mouthpiece and concentrate on compression of the softened material toward the gums and teeth with firm finger and tongue pressure.
  • Sleep on your side. The jaw naturally drops back when you sleep on your back which causes lower jaw to drop back and lose its retention in the device. Back sleepers always have this issue no matter what device is used.
  • This tip works like magic. With the device in place, place your tongue forward into the opening, gently bite down and suck and swallow all your saliva. There will be a noticeable suction effect which will hold the jaws in their proper position. It might need to be repeated during the night.
  • You could be interfering with the device during sleep with your tongue; wear the device during the day to get used to the feeling and speed up the adjustment period.
  • If the snoring does improve but does not stay in well enough, then consider investing in a laboratory fabricated customized mouthpiece.

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What can I do now, it used to work, but now I’m snoring again?

  • Refit the mouthpiece and slightly advance the mouthpiece
  • New factors restricting your breathing, such as weight gain, nasal blockage or other bad sleep habits could be making your snoring worse.
  • If refitting the device does not work discontinue use and consult a medical or dental professional.

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Why do my jaw muscles ache or why does my bite seem different?

  • This, in most cases resolves on it’s on within a week or so. It is common during the adjustment period to experience some jaw discomfort. This is caused because the ligaments holding the jaw become stretched during the night as the jaw is held forward to improve snoring.
  • Solutions:
    • Refit. If the problem persists, the jaw may be pushed too far forward. Refit and move the jaw partially back toward the normal bite location. The mouthpiece can be refitted several times. Always use the fitting handle and follow the original fitting directions.
    • After moving to a less forward location try to sleep with the tongue positioned into the airway opening, which results in a gentle suction pressure. This tongue retention helps reduce the amount of jaw advancement required for snoring and breathing improvement, which in turn reduces the amount of jaw advancement (and soreness) required for snoring and apnea improvement.
    • If the snoring improves but the bite does not feel right, chew sugarless gum in the morning after removing the mouthpiece. This will help reset your bite.
    • After overnight use, you can also rest your chin into your palm with their arm on a desktop. Then allow the weight of your head to guide your jaw back into its usual position.
    • The Two device option: If you can get snoring improvement, you can consult with your dentist regarding a jaw re-positioner which is a mouthpiece used to reset the jaw to its original location after sleeping with the STZ.
    • Jaw pain on one side: When fitting, move the jaw straight forward uniformly. For example, if the jaw hurts on the right you can try advancing in a way that the right side is not stretched as much as the left. This will help reduce the soreness.
    • Practice before fitting to get an idea of how much to do. Allow the jaw to become comfortable again before the next fitting. If the jaw ache persists and or your snoring does not improve, discontinue use of the device and consult the prescribing medical or dental provider.

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Why are my teeth sore or loose?

  • This usually passes in two weeks or less. This is caused from the pressure applied to the teeth while the jaw is being held forward. This situation is rare with the STZ since it offers an improved customized fit and the jaw position is held forward by the side teeth too, not just the front teeth. You are more likely to have teeth soreness, if you have only front teeth.
  • If the condition does not improve gradually you can perform the following: Refit the device to a position with the jaw less forward; move your lower jaw backward.

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Why is there a hole where my front teeth fit?

No problem. This is not generally a concern and will not affect the performance of the device. This is caused when the user bites extremely hard during the fitting process which causes the front teeth to contact the fitting handle.

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Why is the airway small or mostly obstructed?

This occurs when the fitting handle is not fully inserted or clicked into place or the tongue is not used to push the material up against the palate and tissue behind the lower teeth. Refit and perform compression with the tongue in the front inside portion of the device. A new device may be necessary if the opening is closed or very small.

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How can I remove the fitting handle?

To remove the fitting handle, squeeze the front sides and slide off the front retainer clip; then slide out the main part from the inside. Keep the fitting handle and use the same steps if additional fitting is desired.

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What should the STZ look like when properly fitted?

Please see the Following Pictures

  • Top View Outer and inner sides have been firmly compressed to fit the contour of your teeth and gums. The teeth imprints are well defined and clearly evident.
  • Front View Open front airway for tongue retention.
  • Inside View Open tongue space and compression along tongue side of teeth and gums. The two-part fitting handle keeps the airway open during fitting and should be used again for any additional fitting.

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What is the return policy and return information?

Returns & Warranty
Obtain a Return Merchandise Authorization (RMA)
The return procedure is an automated process that you can perform from your own computer. All returns require a RMA number which is generated from your order id and the USPS Return Tracking Number which you supply.

  • You have 30-days from the ship date of your order to qualify for a refund.
  • Most problems with the mouthpiece can be solved by simply reading our comprehensive FAQ. You will have to confirm you read this if you want to return your mouthpiece!
  • Your successful return of the mouthpiece will cancel the balance due after you trial period. The shipping and handling fees of the trial offer are not refundable.
  • You must obtain an RMA number from STZ for our system to process your return request. Having an RMA number does not guarantee you a successful return, you must mail your product back before your trial period ends with your RMA number.
  • Follow these steps to return your STZ
    1. Create a shipping label from the USPS and obtain a valid USPS tracking number (you must ship with the USPS so we can confirm your return status).
      • Note: you can buy and print the shipping label online by going directly to the USPS website or by using a PayPal account. Ship only via USPS to address below. Buyer is responsible for return shipping. No other return shipping method is approved.
      • Ship to:
        SleepTight Mouthpiece
        11352 W State Road 84, Suite 134
        Davie, FL 33325, USA
    2. Take your USPS tracking number and your STZ Order ID (it was sent to you in an email when you purchased) and create an RMA on this page, then print out the RMA form.
    3. Mail all contents sent to you with your STZ order along with the printed RMA paper and mail it before your trial period ends.

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Is there a way I can switch my card to another before the trial ends so I can charge the full payment on a secondary card? My first card is no longer in use.

Unfortunately, at this time you cannot use a second credit card for your order unless the initial credit card is declined. If there is a problem charging the first credit card you have provided to us, we will send you an email on the following Monday. That email will contain a link where you will be able to update your credit card to a different one to pay the remaining amount due.

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What is my order ID?

You can find your order ID on this page: here. It will be emailed to you.

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What is the status of my order?

You can find your order status on this page: here. You will need your order ID and the email you used at the time or order to find it.

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Is there a phone number I can call?

No. We are sorry but SleepTight Mouthpiece does not offer phone support at this time.

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What is the cost of shipping?

We only ship to the United States right now and shipping is included for free within the United States.

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How can I get more technical or professional information regarding the STZ?

If you are interested in using the STZ in your dental or medical practice, send an email to: info@sleeptightmouthpiece.com We generally reply in 2-5 business days.

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Does the STZ contain latex or BPA?

NO. The SleepTight does not contain any latex or BPA. The SleepTight Mouthpiece is composed entirely of a thermoplastic material cleared by the FDA and is also used for athletic sports guards and various dental appliances.

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Where can I read a review of STZ?

The following snoring mouthpiece review sites have reviewed SleepTight Mouthpiece:

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Wake Up
Feeling Great

Try for only: $9.95

Buy for only: $79.90

  • Affordable
  • Easy to use
  • No latex or BPA

*After your trial, just pay a one-time fee of $69.95

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