sentinel hard dental night guard
sentinel hard dental night guardsentinel hard dental night guard side viewsentinel hard dental night guard palate viewhard acrylic night guard for teeth grinding fits seamlessly on teethhow to take teeth impressionsentinel dental impression system step IIsentinel dental impression system step IIIsentinel dental impression system step 4sentinel dental impression system step 5sentinel hard dental night guard

Hard Day or Night Dental Guard 1mm or 2mm


4.99 out of 5
Clear selection


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

  • Easy “how to” instructions ensures consistent teeth impression results
  • Excellent durability and clarity. Custom fit to your unique dental anatomy
  • Choose your own thickness
  • 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
  • One year replacement guarantee if your hard dental night guard wears down!
  • Free retainer case
  • FREE SHIPPING IN US (International customers are responsible for shipping on return mailer only)

Product Description

Here's how it works: The Sentinel Hard Dental Night Guard

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).
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 it’s a good mold.

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

We mail out an impression kit to you (mixing putty & a tray). You take your own impression & using the prepaid envelope, mail it back to us. Upon receipt of your impression, we will fabricate your new custom fit night guard within 8-12 business days. That’s it! 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 ($75 additional charge).

Don’t know whether to choose a dental night guard for your upper or lower teeth? This article on which to choose will help guide you!

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.

Not sure which thickness to choose? Check out this article to help guide you

Have some additional questions about our custom made night guards? Commonly asked questions including why to choose a custom made dental night guard over store bought, fit, warranty information, durability, general teeth grinding info and more HERE!

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 dental 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”.

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. Our commitment to you is 100% satisfaction.

Save 20% on orders over $200 by entering coupon code “big spender” at checkout!

Get Fitted. Get Protected.

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



Additional Information

Weight3 oz

70 reviews for this item

  1. 5 out of 5

    (verified owner):

    Communication is fantastic! The dental impression kit instructions are informative and detailed enough that I can actually tell what’s going on. I took a great impression the first time around. Thanks Guys- GREAT SERVICE

  2. 5 out of 5

    (verified owner):

    When my dentist said he’d give me a deal on my second night guard I was stil heartbroken at the price. So thankful for the internet. Also, pro tip: I use castile soap to clean my mouthguard. Dr. Bronners on Amazon sells a big bottle of it. Better than the harsh toothpastes and denture cleaning solutions! Mouthguard fits perfectly . A+++

  3. 5 out of 5


    Worth every penny! I do all my shopping online already as it is so why not a night guard. Thank you for the great nightguard

  4. 5 out of 5


    After getting a guard through sentinel I now have a slight disdain for my dentist. He tried to charge me $520.00 for the same guard I just got for 135 through sentinel… what a joke. Awesome Price, Awesome Guard!

  5. 5 out of 5

    (verified owner):

    Got my new guard in the mail today! Flawless fit! I’m actually looking forward to sleeping with it in tonight! Thanks Sentinel Team! A++++

  6. 5 out of 5


    Wasn’t to sure about doing this online but the cost difference between my dentist and going online was worth it to find out for me. This worked great! I’m very impressed with Sentinel, they were quick and affordable. Thanks!

  7. 5 out of 5

    (verified owner):

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

  8. 5 out of 5

    (verified owner):

    Same as dentist. Thank you sentinel team!!

  9. 5 out of 5

    (verified owner):

    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!

  10. 5 out of 5

    (verified owner):

    This team really does go to great lengths to meet customer satisfaction. I messed up my first dental impression and was quickly shipped another for free. Then wanted to change types after I received my soft night guard. They upgraded me and I just had to pay the difference in price. Way more flexible than my money hungry dentist! Great customer service.

  11. 5 out of 5


    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? hehee
    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 and save some dough! We are real people who had a great experience!

  12. 5 out of 5

    (verified owner):

    Can’t imagine why I will ever return to a dentist for a dental night guard. You guys are a serious money saver. Thanks bunches :))

  13. 5 out of 5

    (verified owner):

    Very satisfied customer. I was blown away by the exceptional customer service and quality product. Would recommend to anyone.

  14. 5 out of 5

    (verified owner):

    Prompt shipping, fast turn around time and high quality product. Can’t beat it!

  15. 4 out of 5

    (verified owner):

    Had a little trouble taking my dental impression. Had to go through three tries but third times a charm and I got it!
    The night guard fits great. So far so good. Thanks!

  16. 5 out of 5


    I never write these things because I never really care to, but Sentinel really hooked me up. They were really nice on the phone and helped me through the whole process of picking the right guard, shipping, taking my own impression etc. I choose the .40 because I wanted strength but wanted to keep it thin in my mouth since I’m a light sleeper. This company is very professional, thanks for everything.

  17. 5 out of 5

    (verified owner):

    I did not think the quality was going to be the same as my dentist makes but it is just as good if not better and they offer a two year warranty. Can’t beat it!

  18. 5 out of 5


    Thank you so much for the guard! I feel a lot better knowing I saved money and I’m taking care of my teeth.

  19. 5 out of 5

    (verified owner):

    I’ve been paying $600 for a night guard (and replacements) for years through my dentist. I feel like I just got a steal! THANK YOU

  20. 5 out of 5

    (verified owner):

    Just wanted to leave a quick review to let you all know how impressed I am with your customer service and high quality night guard. I have been through many of these (unfortunately paid way too much through my dentist) and I am just over the moon impressed. I highly recommend Sentinel Mouthguards Co. to anyone and everyone. Kudos!

  21. 5 out of 5

    (verified owner):

    I have pretty extensive damage from grinding my teeth for years. I’ve cracked three crowns and broken a veneer from teeth grinding. Needless to say, I should have been wearing a night guard a long time ago. Fast forward thousands of dollars later, I found Sentinel through an article online and decided to go for it. No complaints. The guard serves its purpose well. Thanks Sentinel:)

  22. 5 out of 5

    (verified owner):

    Will order again!! Thank You!! My experience has been wonderful. So glad i found you guys!

  23. 5 out of 5

    (verified owner):

    One word- PERFECT! I had three different guards made by my dentist before I took a chance & ordered through Sentinel. The three guards from my dentist were all uncomfortable & bulky. A complete waste. I was so discouraged. I chose the 2mm night guard and it is perfect. My headaches and facial pain are gone. I’m very happy! All around great experience!

  24. 5 out of 5

    (verified owner):

    Received my night guard about a month ago and have been using it nightly. I went with the .80 hard acrylic dental guard because it’s sturdy and I need to wear it every single night. It took me about a week to get used to it. It’s thin and it fit well but having something in my mouth at night just took some time to get used to. I saved a ton and I feel really good about my purchase. Communication was excellent with Sentinel. I messed up my impression the first time around but they were great about sending me another one right away. Recommended!!

  25. 5 out of 5

    (verified owner):

    Two thumbs up! Excellent

  26. 5 out of 5


    I ended up leaving behind my night guard on a recent vacation in Hawaii. I called the hotel but to no avail. My dentist wanted 400 to replace it!! I couldn’t believe it. Sentinel was a really easy, and affordable solution to an unfortunate problem. Got the same exact night guard my dentist wanted to charge me 400 for at a fraction of the price. 5 STARS!

  27. 5 out of 5


    I was unsure if I could get a custom night guard online to help keep me from grinding my teeth. My Dentist quoted me $500 for a custom night guard and I decided to look online for another option. Glad I did.

    I Had my impression kit within 2 days after my order, from there it was really easy. It also came with step by step instructions on how to take my own impression, along with a website address of an instructional video (which I like since I learn easier visually). I mixed the putty and Took my impression and was done! sent it back in a nice little prepaid envelope they sent with the kit.
    Had my custom night guard within the week. FITS PERFECT! The night guard fit my teeth nice and snug but no added pressure or discomfort and I thought sleeping with guard would get annoying but I don’t even notice it, been sleeping better and my jaw pain has gone away.

  28. 5 out of 5


    Love this night guard! Had to jump on here and give some feedback. From a person who was skeptical to buy online it was a nice surprise to get such a well fitting guard. I’ve gone through so many of these things (from my dentist unfortunately) and the quality is great. It fits perfect. These guys are good!

  29. 5 out of 5


    By far, the most comfortable night guards on the market. These guys take pride in their work and will work with you to your absolute satisfaction. A+++++

  30. 5 out of 5

    (verified owner):

    I am a severe grinder and had an extensive amount of dental work to correct cracked and shortened teeth. I’ve even cracked crowns. I was a bit skeptical about Sentinel but figured it would save me a lot down the line since I average about a night guard every 18 months. My $650 custom night guard has hairline cracks all over after just one year. The process was thoroughly explained in the email and customer service has been excellent. It felt tight at first, but I’ve already gotten used to it after just 3 nights. Not only that I saved $$$, I don’t have to go to the dentist’s for fitting, which alone is a big hassle. I cannot be happier!

  31. 5 out of 5

    (verified owner):

    Snaps in place. Perfect fit! Thanks SM Team!

  32. 5 out of 5

    (verified owner):

    Customer service is on point! Well done Sentinel!!!

  33. 5 out of 5

    (verified owner):

    I received my hard dental night guard & after two nights use I thought maybe I should have chosen the dual laminated guard. Contacted Sentinel & they happily complied with my request to change. By the time I received my new dual laminated night guard I had really adapted to my hard guard & decided to keep it after all (returned the dual laminated one). They were great through the process and went above and beyond to make a night guard that works for me. Highly recommended!

  34. 5 out of 5

    (verified owner):

    Just wanted to let you know I love my mouthguard. Thanks so much! -Patty

  35. 5 out of 5

    (verified owner):

    THank you for your responsiveness and great service. Greatly appreciated:)
    -M. Massey

  36. 5 out of 5

    (verified owner):

    No complaints here. Price was righteous and works well even a year later. Looks professional/high quality and beats dental guards you’d pick up from a retailer like Walmart & CVS. Seriously, why buy junk like that when you can wait three weeks and get something fantastic that is fitted to your teeth and actually works!

  37. 5 out of 5

    (verified owner):

    My nighttime grinding has not stopped ( I guess until there’s a cure this is as good as it gets) but I am at least grinding away on some durable material instead of my teeth. I have noticed my jaw & facial pain has stopped & I am grateful for the two year warranty on these.

  38. 5 out of 5

    (verified owner):

    I really like these night guards. I do not like soft floppy guards. They always seem to move around in the mouth and stretch out over time. These are hard and actually snap on to my teeth. The edges are smooth and not rough to the tongue or gums. This is my second guard from Sentinel and I ordered the 2mm. I would order more.

  39. 5 out of 5

    (verified owner):

    Fantastic experience with a company that is on their game. Smooth, quick process. Even got a couple of night guard cleaning tablets in my package. Would highly recommend!

  40. 5 out of 5

    (verified owner):

    I’d been using the standard night guard (purchased at CVS) but had trouble sleeping throughout the night. The store bought guard was soft & loose fitted. I was considering a high dollar night guard from my dentist when I read a thread on Reddit about Sentinel and the DIY impression system. So, I bought a kit and gave it a try using the putty and trays provided. Easy. Took a great mold of my teeth and got a great fitting, comfortable night guard. Since then, my wife and sister have both bought their own. Lucky to have stumbled across such a money saving alternative.

  41. 5 out of 5

    (verified owner):

    I love this mouth guard because it is perfectly fit to my teeth. It feels great & not bulky at all. Love your service guys!

  42. 5 out of 5

    (verified owner):

    The team at Sentinel was easy to work with and helped me with choosing which night guard was right for me promptly & painlessly. I’ve worked with them before about two years ago, and that was great too! Highly recommended.

  43. 5 out of 5

    (verified owner):

    Love this service. They’re honest and upfront about what they offer. I had a few questions in the beginning. Ashley and the rest of the staff were prompt and helpful.
    I got a great night guard for a portion of what my dentist was charging. Very thankful for this service. Kind regards, Matt

  44. 5 out of 5

    (verified owner):

    Thanks to the talents of the Sentinel team, a very hard, stable & durable night guard was made for my teeth so that I can sleep without having to wake up with the facial pain & headaches I was experiencing nightly. I feel good knowing my teeth are protected & at an affordable price. Muchas gracias for your generosity. *Angelina

  45. 5 out of 5

    (verified owner):

    Pros: thin and comfortable. The night guard doesn’t move around once it’s in and I can’t think of any way it could possibly fall out while I’m sleeping. Since it’s custom-molded it of course fit like a dream and works very well. Bottom line: this night guard is better than anything I’ve ever used and it’s 10 times cheaper than custom night guards made at the dentist office. I am happy to invest $150 bucks on something that protects my teeth from the damages caused by my grinding and the product is fantastic. Get one. You won’t be disappointed.

    Cons: These are very minor, and here is how I overcame these small issues: It took a little bit of work to get a deep teeth imprint when taking the dental impression. I realized afterwards that I just mixed the putty a little too long. So, this could have been prevented. Another thing, I used almost all the material and found that it was a bit too much once it had set but I have a small mouth.

  46. 5 out of 5

    (verified owner):

    Just received my dental guard and wanted to let you know it fits perfect! I was very nervous about using this system. Especially because in the past, the dentist has had to do some adjustments to my guard to get a great fit. This guard instantly snapped in to place. It’s thin and perfect. Thank yoU!

  47. 5 out of 5

    (verified owner):

    Just reordered after my last Sentinel night guard lasted me 4 years. I ordered a 3mm thick one this time and hope to get even more years out of this new one. You have a customer for life and I recommend you to all of my friends & family.

  48. 5 out of 5

    (verified owner):

    Your site was the only one that offered the “choose your thickness” option.
    I am grateful for this, as I wanted two hard night guards in two different thicknesses. One to wear during the day and one at night. The process wan easy and I received my night guards yesterday. Both fit like a glove and I’m looking forward to ordering more in the future.

  49. 5 out of 5

    (verified owner):

    Bill Bass here- Just wanted to check in and tell you all that your company is exceptional and the service you are offering is outstanding. I’ve been a loyal customer for 3 years and don’t plan on going anywhere. Gracias to you all.

  50. 5 out of 5

    (verified owner):

    Chose this guard because I needed a thin appliance to wear during the day. Asked for the guard to be made like my old dental retainer. I sent a picture in for reference via email and received a very nice, very thin retainer-like daytime guard. It is perfect. No one even knows I’m wearing it. I do take it out while I’m eating. My jaw pain from clenching has drastically reduced. Think I may order a thicker night guard for nighttime clenching next but this one has definitely helped my symptoms. Thank you!

  51. 5 out of 5

    (verified owner):

    Just wanted to let you know I received the 2mm night guard and it fits perfectly! Once again, I am very happy and satisfied with your service and Sentinel. Happy New Year and thanks again for everything!


    Janice from Sacramento

  52. 5 out of 5

    (verified owner):

    Excellent product. The night guard was a little tight the first couple of nights but now it feels really great. No more headaches from grinding teeth all night.

  53. 5 out of 5

    (verified owner):

    Have been using my 1st order for almost a year and they are great. Quality is the same if not better than the ones I got from the dentist!

  54. 5 out of 5

    (verified owner):

    Excellent mouthguard. Does not bother me at night or slip out. Actually fits better than one I had made my dentist. Will definitely buy from Sentinel again.

  55. 5 out of 5

    (verified owner):

    Received my Mouth guard fits Perfect!!! -Warren White

  56. 5 out of 5

    (verified owner):

    Thankyou. Your product is awesome. This is my second mouthguard (I lost the first ) and I have recommended you to Dentists and Doctors. It is so comfortable and unobtrusive.



  57. 5 out of 5

    (verified owner):

    This is the best nightguard I have ever owned–better than those I paid $500+ for at the dentist’s. It’s thinner than I am used to which initially concerned me, but the material is extremely strong and durable, so the thinness ends up being a positive because it makes the nightguard less obtrusive and more comfortable.

  58. 5 out of 5

    (verified owner):

    I’ve had my guard for a couple of years and it still works for me…. I am a HEAVY grinder!!! Super comfortable, has held it’s shape perfectly, perfect fit. I will be ordering another one soon, just because I want to have a back up. Amazing product, for real. Incredible price, incredible product.

  59. 5 out of 5

    (verified owner):

    I purchased a hard acrylic mouthguard from Sentinel in 2015 and it still looks great. It fits better than a previous one that a dentist gave me. I sincerely recommend this company for their excellent service and for their low costs. Thank you, Sentinel!

  60. 5 out of 5

    (verified owner):

    I LOVE Sentinel mouth guards! I’ve bought from this company for 5 years – 1mm, 2mm, and 3mm (I’m a heavy grinder) and I’ve always had great service and quality products delivered to my door. For years dentist(s) wanted to charge me hundreds of dollars for just one mouth guard (ridiculous!) and I told them no way and ordered from Sentinel! Don’t let dentists talk you into super expensive mouth guards – Sentinel can make them for you at a fraction of the cost!

  61. 5 out of 5

    (verified owner):

    This is a great service. The response time was excellent, the process easy, and the product just as advertised.

  62. 5 out of 5

    (verified owner):

    Customer Service is A++. I have worn almost every single night for the past 3 years, and the product is still going strong.

  63. 5 out of 5


    I have worn night-guards for over 20 years now, most made by my local dentist. These cost less than 1/4th the price, and are just as good a quality. The fit has been wonderful and I am going to order another pair.

  64. 5 out of 5

    (verified owner):

    I grind my teeth at night and in the day and I’ve worn through many night guards. This is the best one I’ve ever had, and it has cost me the least. I’ve had it for several years now and it hasn’t cracked, discolored or changed shape. I still have my wisdom teeth and Sentinel was able to get me a mouthguard that covered those as well.

    I like the night guard is clear, too. It’s easy to leave in Efferdent all day, daily, and it looks obviously clean. It still looks the same as the day I got it and it has definitely saved my teeth from cracking.

    I also like that the 2mm one is still fairly thin and I can fit it in my mouth. It doesn’t force my lips open at night.

    I’ve also been very happy with Sentinel’s customer service. They replied to me quickly and made sure that I was happy with my product. I plan to order more from them again.

  65. 5 out of 5

    (verified owner):

    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.

  66. 5 out of 5

    (verified owner):

    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!

  67. 5 out of 5

    (verified owner):

    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.

  68. 5 out of 5


    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.

  69. 5 out of 5

    (verified owner):

    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!

  70. 5 out of 5

    (verified owner):

    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!

Add your review