Extreme Hard Custom Night Guard for Heavy Teeth Grinding


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

Made with dentist-grade, hard acrylic-like material, your Extreme Hard Custom 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
  • Safest dental materials. BPA, Silicone, Gluten, Latex, MMA and Phthalate free. Learn more about material safety here.
  • Made in USA. Our work is never outsourced.
  • 3mm thickness for maximum protection
  • Non-flexible. Stays in 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 kit + 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

Product Description

why choose sentinel mouthguards graphic compare to dentist made custom night guard

Extreme Hard Custom Night Guard 

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

Safest dental materials. 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 mouth guard is right for you? Take our free quiz


Wake up Smiling or Your Money Back

The Sentinel Guarantee

Located in St. Petersburg, Florida, we specialize in custom 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.

How does it work?

Taking your own dental impression is EASY (and you do not need to pay a dentist hundreds of dollars to do it). We will send you a plastic tray, dental putty, & a prepaid envelope to mail back to us. You need to have a timer, clean hands, & good solid teeth. No braces. Seriously, putty & braces do not mix. We will give you a link to a video, pictures & written instructions to show how to mold, and make sure its a good mold. All inclusive free shipping

process to receive your custom night guard sentinel mouthguards



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 QR code scan to watch video

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

  • Terri P.

    Half the cost then my dentist is selling for the exact same product and same results.

  • Sylvia Perez

    The communication was excellent, and the turnaround time was very fast. I would highly recommend this company for anyone looking for a reliable night guard provider.

  • Tiffany W.

    The process was easy and straightforward, and customer service was patient and helpful in answering any questions. I received my mouthguard and the fit is flawless. Excellent experience!

  • Zachary R.

    The customer service of this company is wonderful. They’re a small, family owned business and I love that everything is made right here in the USA! I have a gluten allergy and learned that my dentist was using a Chinese lab to make his night guards and couldn’t verify the materials in it! I was able to order a gluten free mouth guard from Sentinel that fits perfectly and I couldn’t be happier! Excellent product and service!!

  • Nadar

    I love my first night guard. Had some dental work done so ordering my second! I suffer from TMJ and this guard I wear for my lower teeth. It helps greatly with my jaw pain. No more popping and clicking since I started using it. The Sentinel team is fast, courteous and the product does the job at a price way lower than my dentist. Amazing!

  • Gina Cameron

    I love my mouthguard that I ordered last year in August and unfortunately I cracked the back piece where my molar grinds down on the guard.
    Sentinel sent me a free replacement. I received it so quickly and it fits perfectly. Thank you for taking care of your customers!

  • Jacky

    Great craftsmanship. Great fit. Overall 5 stars

  • Marie Caputo

    Just want you to know that I received my night guard and the fit is perfect! High quality product with great service! Will be using you again in the future!

  • David Darby

    This product is the real deal!
    I’m writing this review because I recently took my custom night guard that I received back in April to my dentist. I expected him to tell me that it was crap and that I needed to purchase a night guard through his office. Instead he said it was a very well made, great fitting guard. I’m very pleased with the high quality, commitment to safe products and the price! Keep up the good work!


    I LOVE the fit of this night guard! I had tried one from my dentist at a cost of $600. Wore it for 4 nights and threw it out. I tried the store bought guards with no luck. Figured I was out of options until I came across your website. Customer service was great at answering my questions and the guard fits FAR better than the others.

  • Jolene W.

    The guard I ordered a year ago is still good but I had some fillings on my back molars and that changed my bite so I’m reordering. Great product 😀

  • Joseph V.

    You guys have the best customer service. Hands down! I ordered from your company three years ago and just placed a second order. I can’t wait to receive my newest guard. Top notch everything!!

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.