3mm Extreme Durability Hard Night Dental Guard


3mm Extreme Durability Hard Night Guard is for severe teeth grinding/jaw clenching (bruxism)

Made with dentist-grade hard acrylic-like material, your Sentinel Night Guard is non-flexible and solidly built. Safe for nightly use.
All of our night guard products are BPA, Silicon, Latex and Phthalate free.

  • Custom fit to your unique dental anatomy.
  • 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 temporomandibular joints
  • Easy “how to” instructions ensures consistent teeth impression results
  • Excellent durability and clarity.

What You’ll Get

  • A complete impression kit with instructions and prepaid return mailer
  • (1) custom night guard
  • Breathable retainer case
  • Fast all inclusive FREE shipping
  • 1 year warranty

Product Description

Premium 3mm Hard Dental Night Guard for Heavy Duty Teeth Grinding and/or Jaw Clenching

Made with dentist-grade hard acrylic-like material, your Sentinel Night Guard is non-flexible and built for durability. Safe for nightly use. All of our night guard products are BPA, Silicon, Latex and Phthalate free.

If for any reason, you experience pain or discomfort while using your product please discontinue use and contact us. Our commitment to you is 100% satisfaction. We provide free night guard adjustments.


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 the USA by professional lab technicians with a combined dental experience of 20+ years. 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.
    • 90 Day Satisfaction Guarantee. If you don’t LOVE your new night guard (whether it’s a fit issue or comfort) let us know within 90 days. We'll either keep working to your satisfaction or you can opt for a refund in full.
    • 1 Year Warranty. If you break or grind through your night guard within 1 year of purchase, we’ll replace it for you free of charge.

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

If for any reason, you experience pain or discomfort while using your product please discontinue use and contact us. Our commitment to you is 100% satisfaction. We provide free night guard adjustments. 90 Day money back guarantee. Free all inclusive shipping in the USA.

.120 (3mm thickness) An added layer of thickness for extra durability. Ideal for severe nighttime grinding or jaw clenching. Suggested for heavy grinders.

Our Commitment To You

The Sentinel warranty and return policy is unlike any other. We stand by our products and will always work with you to your absolute satisfaction. This means if you are dissatisfied with your product for any reason, you can either contact Sentinel within 90 days for a full refund or opt to continue working with us until you get a great fitting guard. No hassle. No jumping through hoops. Our commitment to you is 100% satisfaction.

Get Fitted. Get Protected.

FREE SHIPPING IN THE U.S.A (International customers are responsible for shipping on return mailer).

Additional Information

Weight3 oz


Guard for


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.

  • 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!

  • Lance Gilchrist

    This mouth guard is amazing. I grind my teeth very heavily during both the day and night though I think I’m clenching more during the day. Brought this into my dentist appointment assuming he was going to tell me it was no good and to buy his $800 mouth guard from his office. He looked at it both in and out of my mouth and said it’s a “very well made guard.” I’ve tried many store brand mouth guards and bit right through those within months. Sentinel will be my go-to brand from now on.

  • Susan Ward

    Great mouth guard! Extremely sturdy and high end.

Free Shipping

We ship to you a kit with everything you need from the molding trays and putty, to the prepaid packaging the return it to us.

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.