Hard Day or Night Dental Guard 1mm or 2mm


The Sentinel Hard Dental Night Guard® is for light to severe teeth grinding/jaw clenching (bruxism)

  • Custom fit to your unique dental anatomy.
  • Non-flexible. Snaps into place for a perfect fit.
  • Easy “how to” instructions ensures consistent teeth impression results
  • Excellent durability and clarity.
  • Choose your own thickness (1mm for light teeth grinding, 2mm for moderate to heavy)
  • Can be used for daytime or nighttime (for daytime choose a 1mm thickness)
  • 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
  • Lifespan 2-5 years
  • All materials are Phthalate, BPA, Silicone & Latex FREE
  • 90 day money back guarantee. We take all the risk!
  • One year replacement guarantee if you crack or wear down your guard!
  • Free retainer case
  • FREE SHIPPING IN US (International customers are responsible for shipping on return mailer only)

Product Description

It's been a hard days' night and you should be sleeping like a log!

Here's how it works

taking your own dental impressionTaking your own dental impression is EASY (and you do not need to pay a dentist hundreds of dollars to do it).

What you get

  • Dental impression kit. 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.
  • (1) Sentinel Hard Dental Night Guard
  • ventilated retainer case

If for any reason you feel your dental impression did not turn out well the first time around, don't worry!  We will send you a redo kit free of charge.

All inclusive free shipping in the US


Want your Sentinel Hard Dental Night Guard faster? Choose the expedited shipping option at checkout. This service includes all inclusive USPS Priority Shipping + a (2) business day turnaround time ($79 additional charge).

Sentinel Hard Dental Night Guard

.40 (1mm thickness) ultra thin, hard dental night guard can be worn comfortably night after night or as a daytime guard. This hard stint secures your teeth in place and provides long lasting durability for light to moderate nighttime grinders.

.80 (2mm thickness) An added layer of thickness for extra durability. Ideal for nighttime grinding or jaw clenching. Suggested for moderate to heavy grinders.

A tip when deciding which night guard is right for you:

Keep in mind that your teeth may naturally shift over time. The Sentinel Hard Dental Night Guard fits snug & perfectly snaps to your teeth. It is an exact fit and leaves plenty of room for jaw movement. If your desire is to wear your night guard consistently (every night or at least several times a week) the hard acrylic night guard will be an excellent choice. If you know you will not wear your night guard on a regular basis, the Sentinel Dual Laminated Night Guard or the Sentinel Soft Dental Night Guard may be a better choice as they are both more adaptable and offer that little bit of "wiggle room".

Wake up Smiling or Your Money Back

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% satisfaction. 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 like your new retainers whether it’s a fit issue or comfort, let us know within 90 days and we’ll refund you in full.
  • 1 Year Warranty. If you break or grind through your night guard within 6 months of purchase, we’ll replace it for you free of charge.

Get Fitted. Get Protected.

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



Additional Information

Weight3 oz

Product Reviews

  • Leah Morris

    I am just writing to thank you for all the work you did to get me a mouth guard that fits comfortably.
    Sentinel mouthguard has great customer service. I had some problems with the original fit of my mouthguard, and they helped me return it 3 times and sent me a new impression packet. I am now completely satisfied with the fit. I would recommend them to anybody. Real value for the money!
    Leah Morris

  • Patrick

    I really like working with sentinel, they’re fast friendly and follow up well. Any problems are cleared up with a no hassle approach. They make it easy when my dog chews my night guard! It’s not funny, but it’s funny cause it’s true.

  • Selina M

    My husband and I bought 4 guards from sentinel just so we would have a backup since we like to travel. So I should be able to write 4 different reviews right??
    All of our night guards fit great. We are very happy with our whole experience with the company and recommended them to all of our friends. If you’re sitting there reading these reviews not sure to make the buy, rest assured this company is the real deal. We are real people who are now customers for life!

  • Jose Torres

    My dentist always made a big deal of adjusting my night guard so I was really worried about this one needing adjustments but I did not need anything at all. It feel great & snaps into place. Makes me think my dentist was doing a bit of “rousing the stone”. Happy customer!

  • Kathy Robinette

    Awesome communication. The mouthguard fits perfectly. Very comfortable. If there is a problem they get right on it. Couldn’t ask for a better company to purchase from and the mouthguard is very affordable. I love Sentinel Mouthguards.You guys are awesome.

  • Devon Hayes

    Excellent service! It has helped my jaw pain out tremendously. Much appreciated -Devon

  • Thomas S

    I have been grinding my teeth at night for many years but had put off buying a night guard because of the high price my dentist charged for one. Back in 2015, I read rave reviews about Sentinel and decided to give the 2mm Sentinel Hard Dental Night Guard a try. The guard has worn a bit in some spots, but it is still totally usable and going strong more than 3 years later! I couldn’t be happier. Thanks Sentinel!

  • Paul Hopkins

    I’ve had bad TMJ for many many years. My dog chewed my last one. Customer service said this is common and that they’re attracted to the saliva? I don’t know but I wasn’t sure this would work for my TMJ because I’ve read that I might need a more complex appliance that moves the jaw into position. I’m happy to report that the hard night guard has offered much relief from my jaw pain and popping. It is comfortable and hard and offers the proper jaw support I need. I’m even happier to report that I saved hundreds of dollars. Much thanks to you guys!

  • Nicholas Sabio

    I purchased a 1 mm bottom guard. The process was easy to take an impression. The guard itself actually fit very well and got used to it within a few nights. I tried others but they were way too bulky, not allowing me to sleep with my mouth closed. I have had this guard for well over a year and just now starting to see signs of wear. I will be ordering another.

  • Allison Montgomery

    Where do I start? This mouthguard is by far the best I’ve ever had. Very professional process from start to finish. It is perfect. I did not think I would be able to wear a mouthguard comfortably throughout the entire night. I’ve never had such a perfect fitting, comfortable mouthguard.

  • Janice

    I LOVE Sentinel mouth guards! I’ve been ordering from this company for at least 5-6 years. Always quality products, wonderful service, and especially unbelievably great prices! Don’t pay the dentists’ high prices – buy from Sentinel and save money for the exact same thing your dentist makes – at a fraction of the cost!

  • John S.

    I’ve had my Sentinel Night Guard since last July after the clicking in my jaw increased and it started to become painful opening my mouth all the way open; also was doing some pretty bad grinding. Although there was a hiccup of my order being processed in the listed timeframe, Sentinel was able to fix the error and rush the turnaround and get my night guard back to me pretty quickly. It has worked wonders and drastically decreased my clicking jaw and wear/tear on my teeth.

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.