Extreme Hard Night Guard for Heavy Teeth Grinding


Extreme Durability Hard Night Guard for Severe Teeth Grinding and Jaw Clenching (Bruxism)

Made with dentist-grade, hard acrylic-like material, your Extreme Durability Hard Night Guard is non-flexible and built to last. Safe for nightly use or as recommended by your dentist.

  • Custom fit to your unique dental anatomy
  • BPA, Silicone, Gluten, Latex, MMA and Phthalate free. Learn more about material safety here.
  • 3mm thickness for maximum protection
  • Non-flexible. Snaps into place for a perfect fit
  • Relieves jaw pain, teeth pain, headaches, tooth sensitivity
  • Protects teeth from breakage, cracking, damage
  • Protects veneers, crowns, restorative dental work
  • Combats pain or tenderness of the TMJ
  • Easy dental impression instructions + extra putty if a reattempt is needed
  • Excellent durability and clarity
  • Love it or your money back! Guaranteed to make you smile.

What You’ll Get

  • A complete impression kit with instructions, extra putty and prepaid return mailer
  • (1) custom night guard for heavy duty teeth grinding and jaw clenching
  • Breathable retainer case
  • Fast all inclusive FREE shipping
  • 1 year warranty
EAN: 697566004698 SKU: 14188 Categories: , , ,

Product Description

Extreme Hard Night Guard for Heavy Duty Teeth Grinding and Jaw Clenching

Made with dentist-grade hard acrylic-like material, your Sentinel Night Guard is non-flexible and built to last. Safe for nightly use.

All of our night guard products are BPA, Gluten, Silicone, MMA, Latex and Phthalate free.

Learn more about the safety of our mouthguard materials here

Our commitment to you is 100% satisfaction. We provide free night guard adjustments and will always work to make you smile.

Not sure which night guard to choose? Take our 60 sec. quiz!

which night guard is right for you


Wake up Smiling or Your Money Back

The Sentinel Guarantee

Located in St. Petersburg, Florida, we specialize in night guard and mouth guard manufacturing.  All of our products are made in our lab by professional lab technicians.

We guarantee:

    • 100% unconditional money back guarantee. We stand behind our products and will provide you with nothing less than our personal best from our long-standing team. If you’re not completely satisfied, return within 90 days for a full refund.
    • 90 Day option to let us get it right. If you don’t love your new night guard let us know within 90 days. We’ll work hard to make it right!
    • 1 Year Warranty.


Due to its thicker nature, we require that you take upper and lower teeth impressions for an even bite and to ensure proper occlusion.

take your dental impression with me

Defend Your Teeth Against The Daily Grind

3mm thickness is ideal for severe nighttime grinding or jaw clenching.

FREE SHIPPING IN THE USA (international customers are responsible for shipping on return mailer).

Product Reviews

  • Carol Williams

    I have been having serious grinding issues since being locked at home- my teeth and surrounding areas including my jaw were in real pain every single day. My jaw would painfully pop when I ate anything or dared to open my mouth too wide- I was miserable. Bought way too many over the counter guards with minimal results. First use of the Sentinel guard and immediately noticed less pain- the very first night. I’ve stuck with it and all of my symptoms are near gone. This product works! I won’t be going back to Walgreens. I’m sticking with quality.

  • Jordan Harris

    I have gnawed through several of this online guards from different companies. I was about to pay $1200 at my dentist for a thicker one when I found the Sentinel team and decided to give them a try. The first impressions I thought were okay but they sent new impressions explaining that they needed a really nice impression to make a proper fitting guard. I retook the impressions. They didn’t charge me for the redos. I got the guard back and it fit perfect. So far so good!

  • Nicholas Abrahamsen

    Read all the good reviews, it’s all pretty much true.

    I will remark on the one item that stops it from getting 5 stars.

    When the dental impression gets back to the lab, they will not notify you that your impression was received. You have to write down the tracking information or contact customer service. I would hope for a better quality of streamlined service here.

    Other than that, it’s an excellent product, but I don’t feel good giving it a full five stars when something so integral overlooked.

  • Edwin Thorpe

    Those night guards at Walgreens are a joke compared to custom made guards. You can tell this guard is made from quality dental supplies versus the cheap plastic ones. This is durable and fits to my mouth perfectly. A+++

  • Kelly L. Beck

    I was a little nervous when I ordered this because similar mouth guards have been uncomfortable, but I thought I would give it a try…what a pleasant surprise they are super comfortable! I ordered both a day guard and this heavy duty one. I love them and would definitely recommend.

  • Mr. Leon

    High quality and beautifully crafted, the 3mm hard guard exceeded my expectations. I especially like that they don’t cut the material straight across. The guard is low profile (it doesn’t extend up over the teeth). I find it comfortable, and the teeth impression process was not too difficult to get done, but i can see that an older person may have trouble because you do have to mix the putty fast and work quickly.

  • Roy Baker

    Been ordering mouth guards from Sentinel since 2013. They have always put the customer first and their product is great. Consistent, good service. You guys have a customer for life.

  • Hugh Jordan

    This mouth guard is great. I sometimes use it during the day when I feel a headache coming on. I know I clench my teeth during the day too. Then I just make sure to clean it and put it by my bedside for night use. Cleans very nicely and easy to store. It doesn’t look cheap. This is a really good price for a high quality mouth guard.

  • Gregory Tominaga

    It’s true there really is a learning curve to wearing a strange plastic thing in your mouth at night. However they do get more comfy overtime. Easy to do the putty process. Hopefully it will last a few years.

  • Oliver Chan

    5 stars!!!

  • Caroline K.

    Didn’t work out for me. Returned the guard with no issues. Easy process just needed to get some corrective work done. All good and will be back in the future.

  • Sam & Jim

    You guys rock! We appreciate you so much. My husband and I are long time customers. We tell everyone about you. Keep up the good work! A+!

Free Shipping

We ship your kit with everything you need from the molding trays and putty to the prepaid return packaging.

90 day guarantee

Try it out! If you’re not satisfied, you can always return the Mouthguard within 90 days for a full refund.

Save 20%

By entering coupon code "big spender", you save 20% on orders over $200.