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

  • Michael Segura

    Outstanding product. Outstanding customer service!

    Let me start by saying that this guard makes sleeping a breeze.
    It’s an excellent guard for the money. I have no complaints about it whatsoever.

    In the past I actually used a boil and bite but wished I had the Sentinel brand guard since they are of much higher quality. I finally pulled the trigger and it’s a true lifesaver.

    More importantly, let me mention how much Sentinel stands behind their product.
    When an issue came up about the impression not holding well enough to remove from the tray, I contacted Sentinel and with no questions asked they stood behind their product and rushed me a new impression kit.
    This type of customer service only comes from a “top-shelf” company that is very secure in the quality of their products. I recommend the company for having the high moral and integrity standards that I wish all manufacturers had.
    Thank you Sentinel

  • dbakepah

    You get what you pay for? This time I got A LOT more than what I paid for! This is probably one of the best night guards I’ve used thus far. I purchased this to help me with my severe teeth grinding and have found it extremely valuable for my teeth and jaw. No more pain in jaw. Teeth sensitivity and headaches are GONE!

  • Sophia Chung

    Genius! I’ll never buy those cheap night guards from Walgreens again! I know some people that are vehemently against wearing a night guard because they’ve never found one that’s comfortable enough. I tell all of them to give Sentinel Mouthguards a try.
    My only word of caution is to pay attention to the directions before mixing the putty. The putty will harden fast! I love these and for the price, I might buy a backup for travel.

  • N. E.

    I love this night guard. I needed a night guard because I grind my teeth. I was in so much pain every night. I’ve worn a custom one from my dentist & a few different ones that you wear on the bottom teeth but I like this one better.

    The one from my dentist was too tight. I asked him to adjust it and he did but it was always still too tight.The store bought lower teeth night guards were too loose and they would just end up on my nightstand.

    This one is perfect. I’ve only had it about a week but it fits great. I have a small mouth and it’s snug on me which is good because it stays on. I don’t think it’s too thick so it doesn’t bother me to wear it. It’s also not extremely thin but I wouldn’t think a thin one would hold up with grinding!

    It teeth impressions were also easy to make! I made sure to pay attention because I knew the fit could be jeopradized if I did it wrong. Overall, I’m very pleased with my purchase.

  • B. Werger

    Thank goodness we can take more that one dental impression because this is not my thing. 😂 After ruining the first two trays, I finally figured out what I needed to do to the 3rd one. I mixed it a lot faster the 3rd time around and it finally worked out for me. After I finally figured it out, I mailed it into the company. Got my night guard back about a week or so after I sent off my impression. I couldn’t believe that there is a product on the market to make a custom mouth guard. After I got my braces off, I think my mouth guard was around $400. This was way less expensive and looks really similar. I’m happy with the end result!

  • Brandy Reagan

    These worked great! I needed the heavy duty as I have been a teeth grinder for many years. Took an impression of both my top and bottom teeth but it’s only to make sure the bite is correct. I’m so grateful because I have a bad overbite, but they still fit over my teeth perfectly!

    The guard stays in place while I’m sleeping! I’ve had a bad run with mouth guards in the past so I’ve been going off and on without protection for way too long. This is a lifesaver! I’m so happy it fits.

  • Robin S.

    I bought this until I can fitted for an occlusal guard for TMJ. The TMJ guard I will be getting is $1200. Ouch! But I have some dental work coming up and I’m not going to spend that kind of money if my dental anatomy is going to be changing.
    It took a few tries before I got a good teeth impression. The instructions say not to “bite down” to form it to your teeth. I did bite down the first time and it caused distortion. I retook it and didn’t get the teeth submerged enough. Used all the putty but the company sent me a new kit for free.
    This is a great temporary solution for me. I’ve only been using it for about a month but so far, I recommend it.

  • Jae Jyoo Wang

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

    This is the most comfortable mouth guard I’ve ever worn. I’m impressed by this brand. Responsive, quick and high quality!

  • Concetta Ellis

    This was better thank I expected. I admit I was a little frustrated with the putty impression process. I was so nervous to take my teeth impression and of course I didn’t do it correctly the first time. I finally settled down and got a nice impression of my teeth. It was easier than I thought it would be.
    The Sentinel lab crew took care to make my guard fit perfectly from the impressions I sent. I’m happy with the final product and will reorder again when the time comes.

  • Eric

    Replacement for an old one I lost or grew legs! This company is consistently awesome. I ordered years ago. Loved my last guard and was a bit worried that things may have changed over the years and the quality might not be the same. But like a good wine, these guys seem to get better with age. Thank you again Sentinel! Cheers!

  • Timothy

    Excellent! I use it every night. Now I can’t be without it. 5 stars!!

  • Chelsea

    Great price for a great product
    This is a fantastic find for a great price.

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.