Is Sentinel Mouthguards worth it? For most light to moderate grinders, yes. Sentinel sells lab-made custom night guards for $165 to $235, well under what a dentist usually charges, and backs them with a 100-night guarantee. The catch is in the fine print. A refund keeps $23, swapping to another guard type ends your right to a refund, and an impression mailed back more than six months after you order can be refused.
How we built this Sentinel Mouthguards review: we haven't worn a Sentinel guard. Instead, on October 27, 2026, we read Sentinel's product pages and policies, its Better Business Bureau file and its FDA registration, and we priced three rival labs. Sentinel pays us a commission through Awin when readers buy, so we've laid out the fine print and the complaints in full.
Key Takeaways
Sentinel Mouthguards Review: The Short Verdict
This Sentinel Mouthguards review comes down to who you are. Sentinel suits you if you grind lightly to moderately, your teeth and gums are healthy, and you can take a putty impression and mail it back within a few weeks. In that case, the Hybrid Guard at $190 is the sensible default, and Sentinel's guarantee gives you 100 nights to decide.
On the other hand, skip it, or see a dentist first, if you have braces, loose teeth or loose dental work. Sentinel itself says not to use its impression kit then. The same goes for TMJ pain under treatment, a bite that has recently changed, or a crown or bridge coming soon. Sentinel won't remake a guard after new dental work, so you'd pay twice.
What Sentinel Sells and What It Costs
Sentinel makes four night guards, plus a separate day guard. Prices below are for one arch, from Sentinel's product pages on October 27, 2026. Ratings are from reviews hosted on Sentinel's own store, which Sentinel controls; the company has no customer reviews on its BBB profile.
| Guard | Material | Thickness | Price | Defect warranty | Store rating |
|---|---|---|---|---|---|
| Comfort Guard | Soft EVA | 2 mm | $165 | 6 months | 4.83 (265 reviews) |
| Hybrid Guard | Soft EVA inside, hard copolyester outside | 2 mm | $190 | 1 year | 4.82 (185) |
| Hard Guard | Hard copolyester | 2 mm | $215 | 1 year | 4.74 (165) |
| Durability Guard | Hard copolyester | 3 mm | $235 | 1 year | 4.92 (164) |
| No-Show Day Guard (daytime) | Hard copolyester | 2 mm | $180 | 1 year | 4.79 (70) |
Standard shipping is free to the lower 48 states. By contrast, the $80 express option, which adds Priority Mail each way and a two-day lab turnaround, isn't refundable. Extra impression kits cost $15 after the first free redo. In addition, Sentinel says its materials are free of BPA, BPS, MMA, PVC, phthalates and latex. Those are the company's own claims, and we found no independent test of them.
How Ordering Works
You order online, and Sentinel mails a putty impression kit within a business day. Mixing and setting the putty takes about five minutes. If your dentist already has an intraoral scan, you can email the STL or PLY file instead and skip the kit. Sentinel says it accepts files from iTero, 3Shape TRIOS, Medit and Carestream scanners.
After that, the lab scans your impression, prints a resin model of your teeth, forms the guard over it, and trims the edges by hand. Sentinel quotes 3 to 7 business days in the lab, plus 2 to 5 days of mail each way. It also says most customers have their guard within two weeks. Two more details matter here:
- Sentinel makes an upper guard by default. It says over 90% of customers pick upper, and it suggests a lower guard if you prefer its fit or your dentist recommends one.
- The guard stops short of your wisdom teeth unless you ask for them before the lab starts.
Online labs differ most in the finishing. Sentinel says a technician hand-trims every guard on a printed model of your teeth.
Sentinel also stopped shipping internationally, citing import fees, so the service is effectively US-only. Hawaii, Alaska and Puerto Rico pay $20 for standard shipping.
The 100-Night Guarantee, Read Closely
First, the headline promise: sleep on the guard for up to 100 nights, and if it isn't working, return it for a refund minus $23. Within that window, Sentinel also offers three attempts to fix the fit, in any mix of adjustments, remakes and one free redo kit. If the third attempt fails, you still get the same refund minus $23. Sentinel's refund policy then adds conditions the product pages don't repeat:
- An exchange ends your refund rights. If you swap to a different guard type, the new guard is no longer refundable under the guarantee.
- Adjustment requests have a shorter clock. The refund policy says all adjustment requests must be made within 30 days of receiving the guard. The product pages, by contrast, describe fit fixes within the 100 nights. If your guard feels off, ask in the first 30 days.
- The impression must come back within six months of your purchase, or Sentinel can reject or cancel the order.
- No remake after dental work. A new crown or filling after your guard was made means a new purchase.
- Returns have their own deadline. The guard must reach Sentinel within 30 days of your refund request.
Two clocks run at once: some deadlines count from the day you order, the rest from the day the guard arrives.
Chart description
Counted from purchase: return an unused kit within 30 days and mail back your impression within 6 months. Counted from delivery: ask for adjustments within 30 days, return or exchange within 100 nights, defect warranty 6 months on the Comfort Guard and 1 year on the others.
So what does a guard that doesn't work out cost you? On a standard order, $23. If you paid for express service, it's $103, since the $80 fee isn't refunded. That's a modest risk for a custom device. Still, mail your impression back promptly and raise any fit problem in the first month.
What the BBB File Shows
Sentinel Mouthguards LLC, in St. Petersburg, Florida, has a B+ rating from the Better Business Bureau and isn't BBB accredited. Its profile lists a start date of May 15, 2014, nine complaints in the last three years, and seven of them in the last 12 months. Sentinel answered all nine, and two are marked resolved.
Nine complaints is a small number for a company with hundreds of store reviews, so treat it as a pattern check rather than a verdict. Even so, four of the nine turn on a deadline. Specifically, two customers mailed impressions back after more than six months, one reported a missing delivery about eight months later, and one came back after the warranty window had closed. Another disputed the $23 fee on an exchange. The rest concern fit or a cracked guard. One customer also blamed a guard that left out the wisdom teeth for a bite problem, which Sentinel denied.
Most of Sentinel's complaints start with timing, so open the kit and mail the impression back as soon as it arrives.
What "FDA Registered" Does and Doesn't Mean
Sentinel's pages say its lab is "FDA registered," and that checks out. FDA's database lists Sentinel Mouthguards in St. Petersburg as a registered manufacturer for 2026, registration number 3039524192. It lists the "Sentinel Custom Dental Night Guard" under the agency's category "mouthguard, over-the-counter," a listing created in July 2025.
But registration isn't approval. Federal rules state that registering a device establishment "does not in any way denote approval of the establishment or its products" (21 CFR 807.39 (opens in a new tab)). FDA's 510(k) database also shows no premarket clearance in Sentinel's name. Separately, product pages mention "FDA-cleared materials." That could refer to clearances held by the material makers, but we couldn't confirm it in FDA's records.
Sentinel vs. Other Online Labs
Sentinel's prices sit in the middle of the market. Here's what three other labs listed on the same day for one arch:
| Lab | Soft | Hybrid (dual-laminate) | Hard |
|---|---|---|---|
| Sentinel Mouthguards | $165 | $190 | $215 (3 mm: $235) |
| Chomper Labs | $159 | $179 | $179 |
| Pro Teeth Guard | $179.99 | $199.99 | $219.99 (acrylic) |
| ClearClub | Priced by thickness, one arch: The ClearClub Guard $155, $170, $180; Clear Custom Night Guard $173, $255, $309.50; about $95 per guard on a subscription | ||
Among the labs that price by material, Chomper Labs lists the lowest hybrid and hard prices, and its site showed a $20-off promotion that day. Pro Teeth Guard's hard guard is acrylic, whereas Sentinel's is copolyester, which Sentinel markets as free of methyl methacrylate. Prices change often, so check before you order. For the full comparison of buying routes, see our dental night guards guide. For picks across brands by how hard you grind, see our best night guards for teeth grinding.
Sentinel vs. a Dentist-Made Guard
A dentist-made guard typically costs $300 to $800 or more, as our night guard cost guide shows, so the savings range from under $100 to more than $600. Insurance can narrow that gap. Dental plans pay for guards through a dentist's claim, under codes D9944 to D9946 in UnitedHealthcare's 2026 policy (opens in a new tab). None of the Sentinel pages we checked mention insurance or HSA and FSA cards. If your plan covers guards, run the numbers in our guide to whether dental insurance covers night guards first.
The dentist route is still worth the premium in some cases. These include heavy grinding that has already cracked or worn teeth, a complex bite, TMJ under treatment, and recent crowns or bridges. That's because a dentist checks the guard in your mouth and adjusts it there, while Sentinel only sees an impression. Our comparison of custom, boil-and-bite and dentist guards covers that trade-off.
Which Sentinel Guard to Pick
Start with how hard you grind, and use Sentinel's own descriptions as a guide:
- Light grinding or sensitive teeth: the Comfort Guard ($165). Sentinel pitches it on comfort rather than durability, and it carries only a six-month warranty.
- Moderate grinding or morning jaw soreness: the Hybrid Guard ($190), soft inside and hard outside.
- Heavy grinding, or you've worn through a softer guard: the Hard Guard ($215).
- Severe grinding with tooth damage or strong jaw pain: the 3 mm Durability Guard ($235).
If you clench more than you grind, firmer materials usually work better; our guide to the night guard for clenching explains why. Either way, a guard protects your teeth but doesn't stop the grinding, and Sentinel says so in its own FAQ. See a dentist first if you have loose teeth, gum disease, TMJ pain or dental work planned.
Frequently Asked Questions
Is Sentinel Mouthguards legit?
Yes. It's a Florida company in business since 2014, with an FDA-registered lab and a B+ BBB rating. Its nine BBB complaints in three years mostly involve missed deadlines, fit problems and the $23 refund fee, and Sentinel answered all of them.
How long does a Sentinel night guard take?
Usually about two weeks. The kit ships within a business day, mail takes 2 to 5 business days each way, and the lab takes 3 to 7 business days. The $80 express option shortens each step.
Can you return a Sentinel night guard?
Yes, within 100 nights of delivery, for a refund minus $23. Exchanging for another guard type ends your refund eligibility, and the expedited fee isn't refunded.
Does insurance cover a Sentinel night guard?
Sentinel doesn't mention insurance anywhere we checked. Dental plans pay for guards through a dentist's claim, so if your plan covers occlusal guards, compare that cost with Sentinel's price first.
Is the Sentinel Hybrid or Hard Guard better?
The Hybrid suits moderate grinding and feels softer against your teeth. The Hard Guard is for heavy grinding or anyone who has worn through a softer guard. Both carry a one-year defect warranty.
The Bottom Line
Our Sentinel Mouthguards review comes out positive with conditions. The guards are priced in line with other online labs, the 100-night guarantee is real, and the complaint record is small. The conditions are the deadlines: mail your impression back quickly, flag fit problems within 30 days, and think twice before an exchange. If you have dental work coming, braces, loose teeth or TMJ under treatment, see a dentist instead.
This review is for general information and isn't dental advice. Prices and policies were checked on October 27, 2026, and can change. If your teeth or jaw hurt, see a dentist.
Sources
- Sentinel Mouthguards: Refund Policy
- Sentinel Mouthguards: Shipping Policy
- Sentinel Mouthguards: How It Works (100-Night Outcome Guarantee and Three Attempts)
- Sentinel Mouthguards: Tru-fit Process
- Sentinel Mouthguards: Materials and Safety
- Sentinel Mouthguards: Night Guards (prices and product details)
- Better Business Bureau: Sentinel Mouthguards LLC profile and complaints
- FDA Establishment Registration and Device Listing: Sentinel Custom Dental Night Guard
- 21 CFR 807.39: Misbranding by reference to establishment registration
- UnitedHealthcare Dental Clinical Policy DCP019.13: Occlusal Guards (effective January 1, 2026)
- Chomper Labs: Night Guards, Pro Teeth Guard: Hard Acrylic Night Guard, ClearClub: Clear Custom Night Guard and ClearClub: The ClearClub Guard (prices checked October 27, 2026; ClearClub rechecked October 28, 2026, including subscription pricing)
