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

  • Alex Jackson

    The process was smooth and I received my night guard for teeth grinding quickly. So far, my jaw feels much better and my headaches are not as frequent in the morning. I think I may need one for daytime too. Ugh!
    Either way, at least these are way more affordable than my dentist!

  • Nicholas Cook

    So glad they started offering the 3mm night guard. I grind so badly that my teeth were wearing through the 2mm hard guard. I’ve had this one for 8 months now and so far so good!

  • Sentinel customer

    Excellent product. Works exactly as advertised. I can breath easier, drink and even speak clearly. But even better is that it took us 3 attempts to mold the impression correctly and each time, Sentinel was patient with us and helped us until we got it right. Remarkable product. And let me add that my wife and I have had many of these from the dentist over the years. These are just as durable.

  • K.D.

    Product works great! It comes with a nice storage case. Definitely recommend!

  • A. Valenzuela

    I was looking for a safe mouth guard and researched heavily. I asked several companies what was in their materials that they use and most were either vague or didn’t respond. This was the only company that I found that was willing to be transparent about the products they use.
    I did confirm that the plastic is BPA free which was my main concern. The night guard took many nights to get used to but I finally enjoy wearing it. Thank you for being a reputable company. -Alicia

  • Art C.

    I love this guard. It fits perfectly. I can’t sleep without it and it’s helped my TMJ tremendously. Thank you! -Arthur

  • Sandy Mcqueen

    Top notch service and outstanding, high quality product! I love your night guards and they have saved my life! I was spending so much unnecessary money at the dental office and then when I couldn’t afford that, I went to the drugstore options. Ugh! So happy that you have an affordable option that LASTS! Love you guys!

  • Melissa

    The product is fine but ultimately didn’t work for what I needed it for. Resulted in a refund. Refund process was easy.

  • Shana Odlen

    Spoke with Alexandra and she was very helpful and recommend that a ask for some extra putty!!

  • Rebecca Streeter

    Better than my dentist! A+++

  • Mel H

    I got this for my elderly mother because she grinds her teeth VERY badly at night. Her mouth is tiny, and since the process requires taking a teeth impression, I asked for extra material. Getting the teeth impression on her tiny mouth was a little difficult but only because again, small mouth. It molds and hardens very quickly. in a matter of 2 minutes, so it may take a couple of tries to get it perfect, but overall it’s easy to use, and has easy directions. She says the mouth guard fits her well. A good purchase for the money in my opinion.

  • Jake B.

    Great product, not too bulky. Way less than the dentist. Happy customer!

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.