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

  • Melissa Chung

    It took me quite a while to actually start wearing a night guard. I let my TMJ get so bad that I was experiencing a crunching sound in my jaw. I couldn’t afford the ones from the dental office so decided to give this a try. I’ve had this guard now for a few weeks and my jaw feels SO MUCH BETTER. I have to wear it every night. There were a couple of nights I forgot to put it in and I felt it the next morning. Now, it’s not completely gone. I still have some mild pain but nothing like what I was experiencing. With complete gratitude, thank you Sentinel.

  • Mark Sampet

    I chose Sentinel Mouthguards largely because I’ve heard nothing but good things about their customer service. I’m happy to report that my experience was wonderful. They make it easy, fast and friendly! In this crazy world that we live in, I appreciate their extra effort to ensure that I am satisfied. Thank you Sentinel Mouthguards!!

  • Leah B.

    Okay here is my experience with Sentinel Mouthguards:

    The process is easy but you have to pay attention to the impression instructions. I failed my first two attempts because I mixed the putty for too long the first time and the second time I distorted the impression because I moved the tray around while it was in my mouth. Both times were admittedly my fault but I was still frustrated at the time it happened.

    The customer service is excellent. They were prompt and friendly. Sent me a new kit with no charge. I got a great impression of my teeth. Waited about a week and 1/2 and sure enough my mouth guard came. It comes in a black retainer case. I tried it in and it fit well. Took me a few nights to get used to it but the quality is great and I saved so much money going the online route instead of my dentist. Not to mention the hassle of driving back and forth.

    I wear mine nightly. I called and they gave me some cleaning instructions. Pretty simple. Use a mild soap and a soft toothbrush. Make sure you rinse it well and dry it completely. This will prevent yellowing. I’m already seeing a few grind marks on the guard but better on the guard than my teeth grinding together!

    Overall, I highly recommend Sentinel Mouthguards. The experience was impressive and quick.

  • Lindsey R.

    I ordered a lower guard to start. When I received it, I realized my tongue likes to flick it up at night. I called the company and they switched me to an upper guard. I already had the upper impression on file with them because with these heavy duty guards, they require both an upper and lower teeth impression. Super easy and convenient! I was sent the upper teeth guard and it fits perfectly. This product is excellent and the customer service is amazing!

  • Angelina Musik

    A+ service. I recommend to all of my family and friends!

  • Jamie T.

    Can’t believe I’m writing a product review for a mouth guard but it’s really that good.

    I have gone through so many professionally made dental night guards and I’ve never liked any of them.
    This mouth guard is not only a great value but it fits over my teeth perfectly. Because they take the time to shape it to the contours of my teeth, it actually fits to my teeth like a glove. Just because you pay to have a custom made night guard doesn’t mean that it’s going to fit like this. I have had several guards made by dentists that didn’t fit this good! These technicians know what they’re doing. I recommend this company to everyone I know and I’m happy to write a glowing review for them.

  • Leo Kreft

    Great company! Great product! I highly recommend Sentinel Mouthguards!

  • Kimberly Strickland

    Best sleeping night guard I’ve ever used

    Much easier to sleep in than the one I got from my dentist. It’s still thick but much less bulky if that makes sense.
    May purchase a second one while it’s at this price (dentist charged $500).

  • Nick Doty

    I bought this on Amazon originally and have been a customer ever since. Great find and the price is right. Wearing a night guard has helped me tremendously.Instead of waking up with my jaw screaming at me, I just wake up like a normal person now. I do have to wear mine nightly and notice that the jaw pain starts creeping back up on me if I’m not consistent. The teeth impression kit is straight forward and they give you an extra putty if you mess up.

  • Tasha H.

    Although my first guard didn’t fit right, Sentinel was quick to make me a free replacement and it fit perfectly. I didn’t mind the hiccup because I literally saved hundreds of dollars by not going through my dentist. Easy to get used to wearing and I love their attention to customer care!

  • Becca Faulk

    I have tried night guard from other online manufacturers for heavy teeth grinding and this is the best. Fit is good, fast delivery.

  • James Ramos

    Needed an adjustment. They had me print out a tooth chart and circle the teeth area that the guard was too tight. I sent it in and it was very quickly returned to me with the correct adjustments. My guard fits great now and I am pleased with the service.

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.