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

  • Omar Willets

    Beautifully made.

    I have to admit I was a bit skeptical in the beginning. It was a bit stiff and uncomfortable but then after a few nights it just seemed to loosen up and adjust to my mouth. For the price versus what my dentist wanted to charge me, I feel good about my purchase. It really is a nice mouthguard. I appreciate the extra attention to the shape. I’ve had mouth guards in the past that they cut straight across and even had jagged edges. This one is nicely done. Definitely worth it.

  • Matthew Evans

    My most recent order is the second time that I have ordered from this company. They are sturdy, and very reliable. The reason for needing new ones is that my back molars grind so intensely at night that I ground through the first one. I think I ordered the first in 2017 so it did last me a while. I would highly recommend this product to anyone looking for a quality night guard.

  • Paula Bendal

    I’ve tried several night guards from other companies and my best experience has been with Sentinel Mouthguards. High quality mouth guard and very responsive customer service. The guard arrived in a timely manner and fit good right out of the packaging.

  • Aldo Doss

    Just like my dentist made guard but even better! Fits like a glove. I’m very pleased with the overall experience.

  • Betty C.

    I was looking for a night guard that is BPA and gluten free. Customer service was very helpful and took care of my questions. Received the dental guard and have been using for a few weeks. So far, so good. Quality seems high. I’ll edit my review if necessary.

    Edit 11/21/21

    The guard showed a bit of wear and tear at about the 1 year mark. I called the company and they smoothed the molar area down for me for free. They said if I had worn all the way through it, they would replace it for free. But the smoothing those rough spots out made the guard like new again so I was happy.

  • LJomack

    Are we able to give 6 stars??
    I had bought twice previously, this time I wanted a change in thickness. They were so professional, working with me through discussing if the thickness upgrade would be a better fit for me.
    I’m very pleased with it. The quality is superb. I frequently grind my teeth and can notice a major difference when I wake up after wearing my night guard. Well worth the price.BTW if you are shopping for night guards, this is the only company I have found that offers so many different options as far as thickness and material type goes. I love that they seem to truly care about making sure I love my product. Highly recommend. Thank you

  • R.J.

    I’ve had mine for about 6 months. I would recommend these to anyone! Except maybe someone who has never worn one before as the 3mm is thicker but more durable than the 2mm. I’ve had both and I prefer the 3mm because I’m a heavy clencher. Make sure you’re cleaning it well. My other one (2mm one) turned yellow after a while so I’m taking good care of this new one.

  • Jacqueline Poyner

    Great Night Guard, Read the Instructions!

    This is probably one of the best night guards for me that I’ve used thus far. I purchased this to help with my teeth grinding, but have found it extremely helpful for snoring too. I’m satisfied with the product and will order another when the time comes. Thank you!

  • Sandra Rubio

    I grind my teeth bad. My jaw can go from feeling awful to okay depending on the day or week.Even with pretty uncomfortable jaw pain, I still refused to wear a night guard. This went on for years. When I started getting sharp pains behind my eye I knew I had to do something. I tried the store bought ones. Waste of money. The Sentinel guard felt tight at first but now I’m used to it. My headaches and jaw pain are GONE! I wear it every night. It’s truly made my life better. I feel younger strangely. Not in pain and grumpy. Thank you for making a life changing product Sentinel! I’m a customer for life.

  • Sunshine Girl

    My dentist had been recommending a night guard for my teeth grinding but I couldn’t spend the money. Finally it got to the point where my teeth were wearing down, jaw was aching so bad, and I had headaches almost every morning. I found Sentinel online and the price is inexpensive compared to the dentist. I was sent a kit with the putty mixture and an extra set of putty in case needed. I took the impressions. FYI they make you take an upper and lower to check the bite before shipment. It took about a week and a half after I sent the impressions off to receive my night guard. It took me a few nights to get used to it but now I can’t sleep without it! Wish I could give more than 5 stars. Excellent experience. Love that this is available to us as an affordable option.

  • Satyam


  • Kristy D.

    Much less expensive than the dentist yet seems to be the same quality. Headaches and jaw pain have gone away! Easy set up.They provide you with simple instructions. I recommend!

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.